{"id":567,"date":"2024-01-26T15:51:25","date_gmt":"2023-07-06T22:33:47","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95\/"},"modified":"2025-08-02T19:21:26","modified_gmt":"2025-08-02T11:21:26","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95\/","title":{"rendered":"2023\u5e74MySQL\u7d22\u5f15\u5b8c\u5168\u6307\u5357\uff1a\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u4e0e\u4f18\u5316\u6570\u636e\u5e93"},"content":{"rendered":"<p>\u4f5c\u8005\u9009\u62e9\u5c06 Diversity in Tech Fund \u4f5c\u4e3a Write for Donations \u8ba1\u5212\u7684\u4e00\u90e8\u5206\u6536\u5230\u6350\u6b3e\u7684\u53d7\u76ca\u65b9\u3002<\/p>\n<h3>\u4ecb\u7ecd<\/h3>\n<p>\u5173\u7cfb\u578b\u6570\u636e\u5e93\u53ef\u4ee5\u7528\u4e8e\u5904\u7406\u4efb\u610f\u5927\u5c0f\u7684\u6570\u636e\uff0c\u5305\u62ec\u62e5\u6709\u6570\u767e\u4e07\u884c\u7684\u5927\u578b\u6570\u636e\u5e93\u3002\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff08SQL\uff09\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u800c\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u57fa\u4e8e\u7279\u5b9a\u6761\u4ef6\u5728\u6570\u636e\u5e93\u8868\u4e2d\u627e\u5230\u7279\u5b9a\u7684\u884c\u3002\u968f\u7740\u6570\u636e\u5e93\u53d8\u5f97\u8d8a\u6765\u8d8a\u5927\uff0c\u5728\u5176\u4e2d\u5b9a\u4f4d\u7279\u5b9a\u884c\u53d8\u5f97\u8d8a\u6765\u8d8a\u56f0\u96be\uff0c\u5c31\u50cf\u662f\u5728\u5927\u6d77\u635e\u9488\u3002<\/p>\n<p>\u6570\u636e\u5e93\u5177\u5907\u63a5\u53d7\u5e7f\u6cdb\u67e5\u8be2\u6761\u4ef6\u7684\u80fd\u529b\uff0c\u8fd9\u8ba9\u6570\u636e\u5e93\u5f15\u64ce\u96be\u4ee5\u9884\u6d4b\u54ea\u4e9b\u67e5\u8be2\u6700\u5e38\u89c1\u3002\u65e0\u8bba\u6570\u636e\u5e93\u8868\u7684\u5927\u5c0f\u5982\u4f55\uff0c\u5f15\u64ce\u5fc5\u987b\u80fd\u591f\u9ad8\u6548\u5730\u5b9a\u4f4d\u884c\u3002\u7136\u800c\uff0c\u968f\u7740\u6570\u636e\u91cf\u589e\u52a0\uff0c\u641c\u7d22\u6027\u80fd\u53ef\u80fd\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u6570\u636e\u96c6\u8d8a\u5927\uff0c\u6570\u636e\u5e93\u5f15\u64ce\u8d8a\u96be\u5feb\u901f\u627e\u5230\u4e0e\u67e5\u8be2\u5339\u914d\u7684\u6587\u6863\u3002<\/p>\n<p>\u6570\u636e\u5e93\u7ba1\u7406\u5458\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u5e2e\u52a9\u6570\u636e\u5e93\u5f15\u64ce\u5e76\u63d0\u9ad8\u5176\u6027\u80fd\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u4ec0\u4e48\u662f\u7d22\u5f15\uff0c\u5982\u4f55\u521b\u5efa\u7d22\u5f15\u4ee5\u53ca\u7d22\u5f15\u662f\u5426\u7528\u4e8e\u67e5\u8be2\u6570\u636e\u5e93\u3002<\/p>\n<h2>\u5148\u51b3\u6761\u4ef6<\/h2>\n<p>\u8981\u6309\u7167\u6b64\u6307\u5357\u64cd\u4f5c\uff0c\u4f60\u9700\u8981\u4e00\u53f0\u8fd0\u884c\u57fa\u4e8eSQL\u7684\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08RDBMS\uff09\u7684\u8ba1\u7b97\u673a\u3002\u672c\u6307\u5357\u4e2d\u7684\u6307\u4ee4\u548c\u793a\u4f8b\u662f\u5728\u4ee5\u4e0b\u73af\u5883\u4e2d\u9a8c\u8bc1\u7684\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u4e00\u53f0\u8fd0\u884cUbuntu 20.04\u7684\u670d\u52a1\u5668\uff0c\u914d\u7f6e\u4e86\u5177\u6709\u7ba1\u7406\u6743\u9650\u7684\u975eroot\u7528\u6237\u548c\u901a\u8fc7UFW\u914d\u7f6e\u7684\u9632\u706b\u5899\uff0c\u5982\u6211\u4eec\u7684Ubuntu 20.04\u521d\u59cb\u670d\u52a1\u5668\u8bbe\u7f6e\u6307\u5357\u4e2d\u6240\u8ff0\u3002<\/li>\n<li>\u5728\u670d\u52a1\u5668\u4e0a\u5b89\u88c5\u5e76\u4fdd\u62a4MySQL\uff0c\u5982\u5982\u4f55\u5728Ubuntu 20.04\u4e0a\u5b89\u88c5MySQL\u4e2d\u6240\u8ff0\u3002\u672c\u6307\u5357\u4f7f\u7528\u901a\u8fc7\u6b65\u9aa43\u4e2d\u63cf\u8ff0\u7684\u6d41\u7a0b\u521b\u5efa\u7684\u975eroot MySQL\u7528\u6237\u8fdb\u884c\u4e86\u9a8c\u8bc1\u3002<\/li>\n<li>\u57fa\u672c\u719f\u6089\u6267\u884cSELECT\u67e5\u8be2\u4ee5\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\uff0c\u5982\u6211\u4eec\u7684\u5982\u4f55\u5728SQL\u4e2d\u4ece\u8868\u4e2d\u9009\u62e9\u884c\u6307\u5357\u4e2d\u6240\u8ff0\u3002<\/li>\n<\/ul>\n<div class=\"post-conf-note\">\n<p class=\"post-note\">\u6ce8\u610f\uff1a<\/p>\n<p>\u8bf7\u6ce8\u610f\u8bb8\u591aRDBMS\u4f7f\u7528\u4e86\u5b83\u4eec\u81ea\u5df1\u72ec\u7279\u7684SQL\u5b9e\u73b0\u3002\u867d\u7136\u672c\u6559\u7a0b\u4e2d\u5217\u51fa\u7684\u547d\u4ee4\u9002\u7528\u4e8e\u5927\u591a\u6570RDBMS\uff0c\u4f46\u7d22\u5f15\u4e0d\u662f\u6807\u51c6SQL\u8bed\u6cd5\u7684\u4e00\u90e8\u5206\uff0c\u6240\u4ee5\u5982\u679c\u60a8\u5728\u9664MySQL\u4e4b\u5916\u7684\u7cfb\u7edf\u4e0a\u6d4b\u8bd5\u5b83\u4eec\uff0c\u786e\u5207\u7684\u8bed\u6cd5\u6216\u8f93\u51fa\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<\/div>\n<p>\u4f60\u8fd8\u9700\u8981\u4e00\u4e2a\u542b\u6709\u4e00\u4e9b\u88c5\u8f7d\u6709\u6837\u672c\u6570\u636e\u7684\u6570\u636e\u5e93\uff0c\u4ee5\u4fbf\u4f60\u80fd\u591f\u7ec3\u4e60\u4f7f\u7528\u7d22\u5f15\u3002\u6211\u4eec\u9f13\u52b1\u4f60\u53c2\u9605\u4e0b\u9762\u7684\u8fde\u63a5\u5230MySQL\u548c\u8bbe\u7f6e\u4e00\u4e2a\u793a\u4f8b\u6570\u636e\u5e93\u90e8\u5206\uff0c\u4e86\u89e3\u8fde\u63a5\u5230MySQL\u670d\u52a1\u5668\u548c\u521b\u5efa\u672c\u6307\u5357\u4e2d\u6240\u6709\u793a\u4f8b\u4e2d\u4f7f\u7528\u7684\u6d4b\u8bd5\u6570\u636e\u5e93\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<h2>\u8fde\u63a5\u5230MySQL\u5e76\u8bbe\u7f6e\u4e00\u4e2a\u793a\u4f8b\u6570\u636e\u5e93<\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u8fde\u63a5\u5230\u4e00\u4e2aMySQL\u670d\u52a1\u5668\u5e76\u521b\u5efa\u4e00\u4e2a\u793a\u4f8b\u6570\u636e\u5e93\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u6309\u7167\u672c\u6307\u5357\u4e2d\u7684\u793a\u4f8b\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u7684SQL\u6570\u636e\u5e93\u7cfb\u7edf\u8fd0\u884c\u5728\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0a\uff0c\u4ece\u60a8\u7684\u672c\u5730\u673a\u5668\u901a\u8fc7SSH\u767b\u5f55\u5230\u60a8\u7684\u670d\u52a1\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"$\"><span class=\"token function\">ssh<\/span> <mark>sammy<\/mark>@<mark>your_server_ip<\/mark><\/li><\/ol><\/code><\/pre>\n<p>\u7136\u540e\u6253\u5f00MySQL\u670d\u52a1\u5668\u63d0\u793a\u7b26\uff0c\u5c06sammy\u66ff\u6362\u4e3a\u60a8\u7684MySQL\u7528\u6237\u8d26\u6237\u7684\u540d\u79f0\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"$\">mysql <span class=\"token parameter variable\">-u<\/span> <mark>sammy<\/mark> <span class=\"token parameter variable\">-p<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a&#8221;\u7d22\u5f15&#8221;\u7684\u6570\u636e\u5e93\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">CREATE DATABASE indexes<span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u5982\u679c\u6570\u636e\u5e93\u6210\u529f\u521b\u5efa\uff0c\u60a8\u5c06\u6536\u5230\u5982\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputQuery OK, 1 row affected (0.01 sec)<\/div><\/code><\/pre>\n<p>\u8981\u9009\u62e9\u7d22\u5f15\u6570\u636e\u5e93\uff0c\u8bf7\u8fd0\u884c\u4ee5\u4e0bUSE\u8bed\u53e5\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"$\">USE indexes<span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u60a8\u5c06\u6536\u5230\u4ee5\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputDatabase changed<\/div><\/code><\/pre>\n<p>\u5728\u9009\u62e9\u4e86\u6570\u636e\u5e93\u4e4b\u540e\uff0c\u60a8\u53ef\u4ee5\u5728\u5176\u4e2d\u521b\u5efa\u4e00\u4e2a\u793a\u4f8b\u8868\u3002\u5728\u672c\u6307\u5357\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u4e00\u4e2a\u60f3\u8c61\u7684\u5458\u5de5\u6570\u636e\u5e93\u6765\u5b58\u50a8\u6709\u5173\u5f53\u524d\u5458\u5de5\u53ca\u5176\u5de5\u4f5c\u8bbe\u5907\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<p>\u5458\u5de5\u8868\u5c06\u5305\u542b\u6709\u5173\u6570\u636e\u5e93\u4e2d\u5458\u5de5\u7684\u7b80\u5316\u6570\u636e\u3002\u5b83\u5c06\u5305\u62ec\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>employee_id: \u6b64\u5217\u4fdd\u5b58\u5458\u5de5\u6807\u8bc6\u7b26\uff0c\u7531int\u6570\u636e\u7c7b\u578b\u8868\u793a\u3002\u6b64\u5217\u5c06\u6210\u4e3a\u8868\u7684\u4e3b\u952e\uff0c\u6bcf\u4e2a\u503c\u5c06\u6210\u4e3a\u5176\u76f8\u5e94\u884c\u7684\u552f\u4e00\u6807\u8bc6\u7b26\u3002<\/li>\n<li>first_name: \u6b64\u5217\u4fdd\u5b58\u6bcf\u4e2a\u5458\u5de5\u7684\u540d\u5b57\uff0c\u4f7f\u7528varchar\u6570\u636e\u7c7b\u578b\u8868\u793a\uff0c\u6700\u591a50\u4e2a\u5b57\u7b26\u3002<\/li>\n<li>last_name: \u6b64\u5217\u4fdd\u5b58\u6bcf\u4e2a\u5458\u5de5\u7684\u59d3\u6c0f\uff0c\u4f7f\u7528varchar\u6570\u636e\u7c7b\u578b\u8868\u793a\uff0c\u6700\u591a50\u4e2a\u5b57\u7b26\u3002<\/li>\n<li>device_serial: \u6b64\u5217\u4fdd\u5b58\u5206\u914d\u7ed9\u5458\u5de5\u7684\u8ba1\u7b97\u673a\u5e8f\u5217\u53f7\uff0c\u4f7f\u7528varchar\u6570\u636e\u7c7b\u578b\u8868\u793a\uff0c\u6700\u591a15\u4e2a\u5b57\u7b26\u3002<\/li>\n<li>salary: \u6b64\u5217\u4fdd\u5b58\u6bcf\u4e2a\u5458\u5de5\u7684\u85aa\u6c34\uff0c\u4f7f\u7528\u5b58\u50a8\u6570\u503c\u6570\u636e\u7684int\u6570\u636e\u7c7b\u578b\u8868\u793a\u3002<\/li>\n<\/ul>\n<p>\u7528\u4ee5\u4e0b\u547d\u4ee4\u521b\u5efa\u793a\u4f8b\u8868\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">CREATE TABLE employees <span class=\"token punctuation\">(<\/span><\/li><li data-prefix=\"mysql>\">    employee_id int,<\/li><li data-prefix=\"mysql>\">    first_name varchar<span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql>\">    last_name varchar<span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql>\">    device_serial varchar<span class=\"token punctuation\">(<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql>\">    salary int<\/li><li data-prefix=\"mysql>\"><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u5982\u679c\u4ee5\u4e0b\u8f93\u51fa\u6253\u5370\u51fa\u6765\uff0c\u90a3\u4e48\u8868\u793a\u8868\u88ab\u521b\u5efa\u4e86\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputQuery OK, 0 rows affected (0.00 sec)<\/div><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u901a\u8fc7\u6267\u884c\u4ee5\u4e0b\u7684INSERT INTO\u64cd\u4f5c\uff0c\u5411\u5458\u5de5\u8868\u4e2d\u52a0\u8f7d\u4e00\u4e9b\u793a\u4f8b\u6570\u636e\u3002<\/p>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u7d22\u5f15\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5411employees\u8868\u4e2d\u63d2\u5165\u591a\u6761\u8bb0\u5f55\u7684MySQL\u8bed\u53e5\u793a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql&gt;\">INSERT INTO employees VALUES<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span>, <span class=\"token string\">'John'<\/span>, <span class=\"token string\">'Smith'<\/span>, <span class=\"token string\">'ABC123'<\/span>, <span class=\"token number\">60000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span>, <span class=\"token string\">'Jane'<\/span>, <span class=\"token string\">'Doe'<\/span>, <span class=\"token string\">'DEF456'<\/span>, <span class=\"token number\">65000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span>, <span class=\"token string\">'Bob'<\/span>, <span class=\"token string\">'Johnson'<\/span>, <span class=\"token string\">'GHI789'<\/span>, <span class=\"token number\">70000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span>, <span class=\"token string\">'Sally'<\/span>, <span class=\"token string\">'Fields'<\/span>, <span class=\"token string\">'JKL012'<\/span>, <span class=\"token number\">75000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span>, <span class=\"token string\">'Michael'<\/span>, <span class=\"token string\">'Smith'<\/span>, <span class=\"token string\">'MNO345'<\/span>, <span class=\"token number\">80000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span>, <span class=\"token string\">'Emily'<\/span>, <span class=\"token string\">'Jones'<\/span>, <span class=\"token string\">'PQR678'<\/span>, <span class=\"token number\">85000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">7<\/span>, <span class=\"token string\">'David'<\/span>, <span class=\"token string\">'Williams'<\/span>, <span class=\"token string\">'STU901'<\/span>, <span class=\"token number\">90000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">8<\/span>, <span class=\"token string\">'Sarah'<\/span>, <span class=\"token string\">'Johnson'<\/span>, <span class=\"token string\">'VWX234'<\/span>, <span class=\"token number\">95000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">9<\/span>, <span class=\"token string\">'James'<\/span>, <span class=\"token string\">'Brown'<\/span>, <span class=\"token string\">'YZA567'<\/span>, <span class=\"token number\">100000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span>, <span class=\"token string\">'Emma'<\/span>, <span class=\"token string\">'Miller'<\/span>, <span class=\"token string\">'BCD890'<\/span>, <span class=\"token number\">105000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">11<\/span>, <span class=\"token string\">'William'<\/span>, <span class=\"token string\">'Davis'<\/span>, <span class=\"token string\">'EFG123'<\/span>, <span class=\"token number\">110000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">12<\/span>, <span class=\"token string\">'Olivia'<\/span>, <span class=\"token string\">'Garcia'<\/span>, <span class=\"token string\">'HIJ456'<\/span>, <span class=\"token number\">115000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">13<\/span>, <span class=\"token string\">'Christopher'<\/span>, <span class=\"token string\">'Rodriguez'<\/span>, <span class=\"token string\">'KLM789'<\/span>, <span class=\"token number\">120000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">14<\/span>, <span class=\"token string\">'Isabella'<\/span>, <span class=\"token string\">'Wilson'<\/span>, <span class=\"token string\">'NOP012'<\/span>, <span class=\"token number\">125000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">15<\/span>, <span class=\"token string\">'Matthew'<\/span>, <span class=\"token string\">'Martinez'<\/span>, <span class=\"token string\">'QRS345'<\/span>, <span class=\"token number\">130000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span>, <span class=\"token string\">'Sophia'<\/span>, <span class=\"token string\">'Anderson'<\/span>, <span class=\"token string\">'TUV678'<\/span>, <span class=\"token number\">135000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">17<\/span>, <span class=\"token string\">'Daniel'<\/span>, <span class=\"token string\">'Smith'<\/span>, <span class=\"token string\">'WXY901'<\/span>, <span class=\"token number\">140000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">18<\/span>, <span class=\"token string\">'Mia'<\/span>, <span class=\"token string\">'Thomas'<\/span>, <span class=\"token string\">'ZAB234'<\/span>, <span class=\"token number\">145000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">19<\/span>, <span class=\"token string\">'Joseph'<\/span>, <span class=\"token string\">'Hernandez'<\/span>, <span class=\"token string\">'CDE567'<\/span>, <span class=\"token number\">150000<\/span><span class=\"token punctuation\">)<\/span>,<\/li><li data-prefix=\"mysql&gt;\">    <span class=\"token punctuation\">(<\/span><span class=\"token number\">20<\/span>, <span class=\"token string\">'Abigail'<\/span>, <span class=\"token string\">'Smith'<\/span>, <span class=\"token string\">'FGH890'<\/span>, <span class=\"token number\">155000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u6267\u884c\u4e0a\u8ff0\u8bed\u53e5\u540e\uff0c\u6570\u636e\u5e93\u5c06\u8fd4\u56de\u64cd\u4f5c\u6210\u529f\u7684\u6d88\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa\u67e5\u8be2\u6b63\u5e38\uff0c20\u884c\u53d7\u5f71\u54cd\uff080.010\u79d2\uff09\r\n\u8bb0\u5f55\uff1a20  \u91cd\u590d\uff1a0  \u8b66\u544a\uff1a0\r\n<\/code><\/pre>\n<div class=\"post-conf-note\">\n<p class=\"post-note\"><span class=\"post-conf-desc\">\u6ce8\u610f\uff1a<\/span><\/p>\n<div>\u6570\u636e\u96c6\u7684\u89c4\u6a21\u8fd8\u4e0d\u8db3\u4ee5\u76f4\u63a5\u8bf4\u660e\u7d22\u5f15\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u3002\u7136\u800c\uff0c\u8fd9\u4e2a\u6570\u636e\u96c6\u5c06\u5c55\u793aMySQL\u5982\u4f55\u5229\u7528\u7d22\u5f15\u6765\u9650\u5236\u904d\u5386\u7684\u884c\u6570\u4ee5\u6267\u884c\u67e5\u8be2\u5e76\u83b7\u53d6\u7ed3\u679c\u3002<\/div>\n<\/p>\n<p>\u6709\u4e86\u8fd9\u4e9b\uff0c\u4f60\u5c31\u53ef\u4ee5\u7ee7\u7eed\u9605\u8bfb\u672c\u6307\u5357\u7684\u5176\u4f59\u90e8\u5206\uff0c\u5e76\u5f00\u59cb\u5728MySQL\u4e2d\u4f7f\u7528\u7d22\u5f15\u4e86\u3002<\/p>\n<\/div>\n<h2>\u7d22\u5f15\u7b80\u4ecb<\/h2>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5728\u5bf9MySQL\u6570\u636e\u5e93\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u6570\u636e\u5e93\u5fc5\u987b\u9010\u884c\u68c0\u67e5\u6574\u4e2a\u8868\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u641c\u7d22\u4e0e&#8221;Smith&#8221;\u5339\u914d\u7684\u5458\u5de5\u59d3\u6c0f\uff0c\u6216\u8005\u5e0c\u671b\u67e5\u8be2\u6240\u6709\u85aa\u8d44\u9ad8\u4e8e$100000\u7684\u5458\u5de5\u3002\u6570\u636e\u5e93\u5c06\u9010\u884c\u68c0\u67e5\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\uff0c\u4ee5\u9a8c\u8bc1\u5176\u662f\u5426\u7b26\u5408\u6761\u4ef6\u3002\u5982\u679c\u7b26\u5408\u6761\u4ef6\uff0c\u8be5\u884c\u5c06\u88ab\u6dfb\u52a0\u5230\u8fd4\u56de\u7ed3\u679c\u7684\u5217\u8868\u4e2d\u3002\u5982\u679c\u4e0d\u7b26\u5408\u6761\u4ef6\uff0cMySQL\u5c06\u7ee7\u7eed\u626b\u63cf\u540e\u7eed\u884c\uff0c\u76f4\u5230\u6d4f\u89c8\u6574\u4e2a\u8868\u4e3a\u6b62\u3002<\/p>\n<p>\u5c3d\u7ba1\u8fd9\u79cd\u627e\u5230\u5339\u914d\u884c\u7684\u65b9\u6cd5\u5f88\u6709\u6548\uff0c\u4f46\u968f\u7740\u8868\u7684\u5927\u5c0f\u589e\u957f\uff0c\u5b83\u53ef\u80fd\u4f1a\u53d8\u5f97\u7f13\u6162\u4e14\u6d88\u8017\u8d44\u6e90\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u5927\u578b\u8868\u6216\u9700\u8981\u9891\u7e41\u6216\u5feb\u901f\u6570\u636e\u8bbf\u95ee\u7684\u67e5\u8be2\uff0c\u8fd9\u79cd\u65b9\u6cd5\u53ef\u80fd\u4e0d\u9002\u7528\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u5927\u8868\u548c\u67e5\u8be2\u7684\u6027\u80fd\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u3002\u7d22\u5f15\u662f\u72ec\u7279\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ea\u5b58\u50a8\u6570\u636e\u7684\u6392\u5e8f\u5b50\u96c6\uff0c\u4e0e\u8868\u884c\u5206\u5f00\u3002\u5b83\u4eec\u5141\u8bb8\u6570\u636e\u5e93\u5f15\u64ce\u5728\u67e5\u627e\u7279\u5b9a\u5b57\u6bb5\u6216\u5b57\u6bb5\u96c6\u7684\u503c\u6216\u6392\u5e8f\u65f6\u66f4\u5feb\u901f\u3001\u9ad8\u6548\u5730\u5de5\u4f5c\u3002<\/p>\n<p>\u4ee5\u5458\u5de5\u8868\u4e3a\u4f8b\uff0c\u60a8\u53ef\u4ee5\u6267\u884c\u4e00\u79cd\u5178\u578b\u7684\u67e5\u8be2\uff0c\u5373\u901a\u8fc7\u59d3\u6c0f\u627e\u5230\u5458\u5de5\u3002\u5982\u679c\u6ca1\u6709\u4efb\u4f55\u7d22\u5f15\uff0cMySQL\u5c06\u4ece\u8868\u4e2d\u68c0\u7d22\u6bcf\u4f4d\u5458\u5de5\u5e76\u9a8c\u8bc1\u59d3\u6c0f\u662f\u5426\u4e0e\u67e5\u8be2\u5339\u914d\u3002\u4f46\u662f\uff0c\u4f7f\u7528\u7d22\u5f15\u65f6\uff0cMySQL\u5c06\u4fdd\u7559\u59d3\u6c0f\u7684\u72ec\u7acb\u5217\u8868\uff0c\u5176\u4e2d\u4ec5\u5305\u542b\u6307\u5411\u4e3b\u8868\u4e2d\u7ed9\u5b9a\u5458\u5de5\u884c\u7684\u6307\u9488\u3002\u7136\u540e\uff0c\u5b83\u5c06\u4f7f\u7528\u8be5\u7d22\u5f15\u68c0\u7d22\u7ed3\u679c\uff0c\u800c\u65e0\u9700\u626b\u63cf\u6574\u4e2a\u8868\u3002<\/p>\n<p>\u5728\u4e2d\u6587\u4e2d\uff0c\u60a8\u53ef\u4ee5\u5c06\u7d22\u5f15\u7c7b\u6bd4\u4e3a\u7535\u8bdd\u7c3f\u3002\u8981\u5728\u7535\u8bdd\u7c3f\u4e2d\u67e5\u627e\u540d\u4e3a\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u7684\u4eba\uff0c\u60a8\u9996\u5148\u7ffb\u5230\u4ee5S\u5f00\u5934\u7684\u59d3\u540d\u5217\u8868\u6240\u5728\u7684\u6b63\u786e\u9875\u9762\uff0c\u7136\u540e\u6d4f\u89c8\u4ee5Sm\u5f00\u5934\u7684\u9875\u9762\u3002\u6309\u7167\u8fd9\u4e2a\u903b\u8f91\uff0c\u60a8\u53ef\u4ee5\u8fc5\u901f\u6392\u9664\u8bb8\u591a\u6761\u76ee\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0e\u60a8\u5bfb\u627e\u7684\u4eba\u4e0d\u5339\u914d\u3002\u8be5\u8fc7\u7a0b\u4e4b\u6240\u4ee5\u6709\u6548\uff0c\u662f\u56e0\u4e3a\u7535\u8bdd\u7c3f\u4e2d\u7684\u6570\u636e\u6309\u5b57\u6bcd\u987a\u5e8f\u6392\u5e8f\uff0c\u800c\u6570\u636e\u5e93\u4e2d\u76f4\u63a5\u5b58\u50a8\u7684\u6570\u636e\u5f88\u5c11\u6309\u8fd9\u79cd\u65b9\u5f0f\u6392\u5217\u3002\u6570\u636e\u5e93\u5f15\u64ce\u4e2d\u7684\u7d22\u5f15\u53d1\u6325\u7c7b\u4f3c\u4e8e\u7535\u8bdd\u7c3f\u7684\u4f5c\u7528\uff0c\u5b83\u4fdd\u6301\u7740\u6309\u5b57\u6bcd\u987a\u5e8f\u6392\u5217\u7684\u6570\u636e\u5f15\u7528\uff0c\u4ece\u800c\u5e2e\u52a9\u6570\u636e\u5e93\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u884c\u3002<\/p>\n<p>\u5728MySQL\u4e2d\u4f7f\u7528\u7d22\u5f15\u6709\u591a\u4e2a\u597d\u5904\u3002\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u662f\u52a0\u5febWHERE\u6761\u4ef6\u67e5\u8be2\uff08\u4f7f\u7528\u7cbe\u786e\u5339\u914d\u6761\u4ef6\u548c\u6bd4\u8f83\uff09\uff0c\u66f4\u5feb\u5730\u6392\u5e8f\u4f7f\u7528ORDER BY\u5b50\u53e5\u7684\u6570\u636e\uff0c\u5e76\u5f3a\u5236\u503c\u7684\u552f\u4e00\u6027\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u80fd\u4f1a\u964d\u4f4e\u6570\u636e\u5e93\u7684\u5cf0\u503c\u6027\u80fd\u3002\u7d22\u5f15\u65e8\u5728\u52a0\u5feb\u6570\u636e\u68c0\u7d22\u901f\u5ea6\uff0c\u5e76\u4f7f\u7528\u9644\u52a0\u7684\u6570\u636e\u7ed3\u6784\u6765\u5b9e\u73b0\uff0c\u8fd9\u4e9b\u7ed3\u6784\u4e0e\u8868\u6570\u636e\u4e00\u540c\u5b58\u50a8\u3002\u8fd9\u4e9b\u7ed3\u6784\u5fc5\u987b\u968f\u7740\u6570\u636e\u5e93\u4e2d\u6bcf\u6b21\u7684\u4fee\u6539\u4fdd\u6301\u66f4\u65b0\uff0c\u8fd9\u53ef\u80fd\u4f1a\u964d\u4f4eINSERT\u3001UPDATE\u548cDELETE\u67e5\u8be2\u7684\u6027\u80fd\u3002\u5bf9\u4e8e\u7ecf\u5e38\u66f4\u6539\u7684\u5927\u578b\u6570\u636e\u96c6\u6765\u8bf4\uff0c\u901a\u8fc7\u6539\u5584SELECT\u67e5\u8be2\u901f\u5ea6\u83b7\u5f97\u7684\u597d\u5904\uff0c\u6709\u65f6\u53ef\u80fd\u4f1a\u88ab\u5199\u5165\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6027\u80fd\u660e\u663e\u53d8\u6162\u6240\u62b5\u6d88\u3002<\/p>\n<p>\u53ea\u6709\u5728\u6709\u660e\u786e\u9700\u6c42\u7684\u60c5\u51b5\u4e0b\u624d\u5efa\u8bae\u521b\u5efa\u7d22\u5f15\uff0c\u6bd4\u5982\u5f53\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u5f00\u59cb\u4e0b\u964d\u65f6\u3002\u5728\u9009\u62e9\u8981\u521b\u5efa\u7684\u7d22\u5f15\u65f6\uff0c\u8003\u8651\u6700\u7ecf\u5e38\u6267\u884c\u5e76\u82b1\u8d39\u6700\u957f\u65f6\u95f4\u7684\u67e5\u8be2\uff0c\u5e76\u6839\u636e\u8fd9\u4e9b\u67e5\u8be2\u6761\u4ef6\u6765\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u83b7\u5f97\u6700\u5927\u7684\u6536\u76ca\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-note\"><span class=\"post-conf-desc\">\u6ce8\u610f\uff1a<\/span><\/p>\n<div>\u672c\u6307\u5357\u65e8\u5728\u4ecb\u7ecdMySQL\u4e2d\u7684\u6570\u636e\u5e93\u7d22\u5f15\u4e3b\u9898\uff0c\u4ee5\u8bf4\u660e\u5e38\u89c1\u7684\u5e94\u7528\u548c\u7d22\u5f15\u7c7b\u578b\u3002\u6570\u636e\u5e93\u5f15\u64ce\u652f\u6301\u66f4\u591a\u590d\u6742\u7684\u7d22\u5f15\u4f7f\u7528\u573a\u666f\uff0c\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u6027\u80fd\uff0c\u4f46\u8fd9\u8d85\u51fa\u4e86\u672c\u6307\u5357\u7684\u8303\u56f4\u3002\u6211\u4eec\u9f13\u52b1\u60a8\u67e5\u9605\u5b98\u65b9\u7684MySQL\u7d22\u5f15\u6587\u6863\uff0c\u4ee5\u83b7\u53d6\u6570\u636e\u5e93\u529f\u80fd\u7684\u66f4\u5b8c\u6574\u63cf\u8ff0\u3002<\/div>\n<\/p>\n<\/div>\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u6b65\u9aa4\u4e2d\uff0c\u4f60\u5c06\u4e3a\u4e0d\u540c\u573a\u666f\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u7d22\u5f15\u3002\u4f60\u5c06\u5b66\u4e60\u5982\u4f55\u9a8c\u8bc1\u7d22\u5f15\u5728\u67e5\u8be2\u4e2d\u662f\u5426\u88ab\u4f7f\u7528\u3002\u6700\u540e\uff0c\u4f60\u5c06\u5b66\u4f1a\u5728\u5fc5\u8981\u65f6\u5220\u9664\u7d22\u5f15\u3002<\/p>\n<h2>\u4f7f\u7528\u5355\u5217\u7d22\u5f15<\/h2>\n<p>\u5355\u5217\u7d22\u5f15\u662f\u4e00\u79cd\u6700\u5e38\u89c1\u4e14\u76f4\u63a5\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002\u8fd9\u79cd\u7c7b\u578b\u7684\u7d22\u5f15\u5e2e\u52a9\u6570\u636e\u5e93\u52a0\u5feb\u6839\u636e\u5355\u5217\u503c\u8fdb\u884c\u6570\u636e\u96c6\u8fc7\u6ee4\u7684\u67e5\u8be2\u901f\u5ea6\u3002\u5728\u5355\u5217\u4e0a\u521b\u5efa\u7684\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u8bb8\u591a\u6761\u4ef6\u67e5\u8be2\uff0c\u5305\u62ec\u4f7f\u7528=\u8fd0\u7b97\u7b26\u8fdb\u884c\u7cbe\u786e\u5339\u914d\u548c\u4f7f\u7528>\u6216<\u8fd0\u7b97\u7b26\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<p>\u5728\u4f60\u4e4b\u524d\u521b\u5efa\u7684\u793a\u4f8b\u6570\u636e\u5e93\u4e2d\uff0c\u6ca1\u6709\u7d22\u5f15\u3002\u5728\u521b\u5efa\u7d22\u5f15\u4e4b\u524d\uff0c\u4f60\u9996\u5148\u4f1a\u6d4b\u8bd5\u6570\u636e\u5e93\u5728\u4f7f\u7528WHERE\u5b50\u53e5\u4ec5\u8bf7\u6c42\u8868\u4e2d\u7684\u4e00\u90e8\u5206\u6570\u636e\u65f6\u5982\u4f55\u5904\u7406SELECT\u67e5\u8be2\u3002<\/p>\n<p>\u5047\u8bbe\u60a8\u60f3\u8981\u627e\u5230\u85aa\u6c34\u6070\u597d\u4e3a100000\u7f8e\u5143\u7684\u5458\u5de5\u3002\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE salary <span class=\"token operator\">=<\/span> <span class=\"token number\">100000<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cWHERE\u5b50\u53e5\u8981\u6c42\u5458\u5de5\u7684\u5de5\u8d44\u4e0e\u6240\u8bf7\u6c42\u7684\u503c\u5b8c\u5168\u5339\u914d\u3002\u6570\u636e\u5e93\u5c06\u5982\u4e0b\u56de\u5e94\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           9 | James      | Brown     | YZA567        | 100000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 row in set (<mark>0.000<\/mark> sec)\r\n<\/code><\/pre>\n<div class=\"post-conf-note\">\n<p class=\"post-note\"><span class=\"post-conf-desc\">\u6ce8\u610f\uff1a<\/span><\/p>\n<div>\u5982\u4e0a\u6240\u793a\u7684\u8f93\u51fa\u7ed3\u679c\u663e\u793a\uff0c\u6570\u636e\u5e93\u51e0\u4e4e\u5373\u65f6\u5730\u5bf9\u53d1\u51fa\u7684\u67e5\u8be2\u505a\u51fa\u4e86\u54cd\u5e94\u3002\u5728\u6570\u636e\u5e93\u4e2d\u53ea\u6709\u5c11\u91cf\u7684\u6837\u672c\u884c\u65f6\uff0c\u4f7f\u7528\u7d22\u5f15\u5bf9\u67e5\u8be2\u6027\u80fd\u51e0\u4e4e\u6ca1\u6709\u660e\u663e\u5f71\u54cd\u3002\u7136\u800c\uff0c\u5728\u5927\u578b\u6570\u636e\u96c6\u7684\u60c5\u51b5\u4e0b\uff0c\u6267\u884c\u67e5\u8be2\u540e\u6570\u636e\u5e93\u62a5\u544a\u7684\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u5c06\u4f1a\u6709\u660e\u663e\u7684\u53d8\u5316\u3002<\/div>\n<\/p>\n<\/div>\n<p>\u4ece\u67e5\u8be2\u8f93\u51fa\u6765\u770b\uff0c\u4f60\u65e0\u6cd5\u77e5\u9053\u6570\u636e\u5e93\u5f15\u64ce\u5728\u8868\u4e2d\u67e5\u627e\u5339\u914d\u884c\u7684\u5904\u7406\u65b9\u5f0f\u3002\u7136\u800c\uff0cMySQL\u63d0\u4f9b\u4e86\u4e00\u79cd\u83b7\u53d6\u67e5\u8be2\u8ba1\u5212\uff08\u5373\u5f15\u64ce\u6267\u884c\u67e5\u8be2\u7684\u65b9\u5f0f\uff09\u7684\u65b9\u6cd5\uff1aEXPLAIN\u8bed\u53e5\u3002<\/p>\n<p>\u8981\u8bbf\u95eeSELECT\u67e5\u8be2\u7684\u67e5\u8be2\u8ba1\u5212\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE salary <span class=\"token operator\">=<\/span> <span class=\"token number\">100000<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>EXPLAIN\u547d\u4ee4\u544a\u8bc9MySQL\u8fd0\u884cSELECT\u67e5\u8be2\uff0c\u4f46\u4e0d\u8fd4\u56de\u7ed3\u679c\uff0c\u800c\u662f\u663e\u793a\u6709\u5173\u6570\u636e\u5e93\u5f15\u64ce\u5982\u4f55\u5728\u5185\u90e8\u6267\u884c\u67e5\u8be2\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u6267\u884c\u8ba1\u5212\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u5185\u5bb9\uff08\u60a8\u7684\u8868\u53ef\u80fd\u7565\u6709\u4e0d\u540c\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n| id | select_type | table     | partitions | type | <mark>possible_keys<\/mark> | <mark>key<\/mark>  | key_len | ref  | <mark>rows<\/mark> | filtered | <mark>Extra<\/mark>       |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n|  1 | SIMPLE      | employees | NULL       | ALL  | <mark>NULL<\/mark>          | <mark>NULL<\/mark> | NULL    | NULL |   <mark>20<\/mark> |    10.00 | <mark>Using where<\/mark> |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n1 row in set, 1 warning (0.00 sec)\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u8868\u683c\u8f93\u51fa\u4e2d\uff0c\u5217\u63cf\u8ff0\u4e86\u67e5\u8be2\u6267\u884c\u7684\u8bb8\u591a\u65b9\u9762\u3002\u6839\u636e\u4f60\u7684MySQL\u7248\u672c\uff0c\u4f60\u7684\u8f93\u51fa\u53ef\u80fd\u4f1a\u5305\u542b\u989d\u5916\u7684\u5217\uff0c\u4f46\u662f\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\uff0c\u4ee5\u4e0b\u662f\u6700\u91cd\u8981\u7684\u4fe1\u606f\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>possible_keys \u5217\u51fa\u4e86MySQL\u8003\u8651\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6ca1\u6709\u4efb\u4f55\u7d22\u5f15\uff08NULL\uff09\u3002<\/li>\n<li>key \u63cf\u8ff0\u4e86MySQL\u5728\u6267\u884c\u67e5\u8be2\u65f6\u51b3\u5b9a\u4f7f\u7528\u7684\u7d22\u5f15\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6ca1\u6709\u4f7f\u7528\u4efb\u4f55\u7d22\u5f15\uff08NULL\uff09\u3002<\/li>\n<li>rows \u663e\u793aMySQL\u5728\u8fd4\u56de\u7ed3\u679c\u524d\u5fc5\u987b\u5355\u72ec\u5206\u6790\u7684\u884c\u6570\u3002\u8fd9\u91cc\u662f20\uff0c\u5bf9\u5e94\u4e8e\u8868\u4e2d\u6240\u6709\u53ef\u80fd\u7684\u884c\u6570\u3002\u8fd9\u610f\u5473\u7740MySQL\u5fc5\u987b\u626b\u63cfemployees\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6765\u627e\u5230\u8fd4\u56de\u7684\u90a3\u4e00\u884c\u3002<\/li>\n<li>Extra \u663e\u793a\u67e5\u8be2\u8ba1\u5212\u7684\u989d\u5916\u63cf\u8ff0\u4fe1\u606f\u3002\u5728\u672c\u4f8b\u4e2d\uff0cUsing where\u6ce8\u91ca\u8868\u793a\u6570\u636e\u5e93\u4f7f\u7528WHERE\u8bed\u53e5\u76f4\u63a5\u4ece\u8868\u4e2d\u8fc7\u6ee4\u7ed3\u679c\u3002<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u6ca1\u6709\u8bbe\u7f6e\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u9700\u8981\u626b\u63cf20\u884c\u624d\u80fd\u68c0\u7d22\u5230\u4e00\u884c\u6570\u636e\u3002\u5982\u679c\u8868\u4e2d\u5305\u542b\u6570\u767e\u4e07\u884c\uff0c\u5219MySQL\u5c06\u4f1a\u9010\u884c\u626b\u63cf\u5b83\u4eec\uff0c\u5bfc\u81f4\u67e5\u8be2\u6027\u80fd\u5dee\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<div>\u8f83\u65b0\u7684MySQL\u7248\u672c\u5728\u4f7f\u7528EXPLAIN\u65f6\uff0c\u5728\u8f93\u51fa\u4e2d\u663e\u793a1\u884c\u7ed3\u679c\uff0c1\u4e2a\u8b66\u544a\uff0c\u800c\u8f83\u65e7\u7684MySQL\u7248\u672c\u548c\u517c\u5bb9\u7684MySQL\u6570\u636e\u5e93\u901a\u5e38\u53ea\u4f1a\u663e\u793a1\u884c\u7ed3\u679c\u3002\u8b66\u544a\u4e0d\u662f\u95ee\u9898\u7684\u6807\u5fd7\u3002MySQL\u4f7f\u7528\u5176\u8b66\u544a\u673a\u5236\u6765\u63d0\u4f9b\u6709\u5173\u67e5\u8be2\u8ba1\u5212\u7684\u8fdb\u4e00\u6b65\u6269\u5c55\u4fe1\u606f\u3002\u8fd9\u4e9b\u9644\u52a0\u4fe1\u606f\u7684\u4f7f\u7528\u8d85\u51fa\u4e86\u672c\u6559\u7a0b\u7684\u8303\u56f4\u3002\u60a8\u53ef\u4ee5\u5728MySQL\u6587\u6863\u4e2d\u7684\u6269\u5c55EXPLAIN\u8f93\u51fa\u683c\u5f0f\u9875\u9762\u4e86\u89e3\u66f4\u591a\u76f8\u5173\u5185\u5bb9\u3002<\/div>\n<\/p>\n<\/div>\n<p>\u4f60\u521a\u521a\u8fd0\u884c\u7684SELECT\u67e5\u8be2\u4f7f\u7528\u4e86\u786e\u5207\u7684\u67e5\u8be2\u6761\u4ef6\uff0c\u5373WHERE salary = 100000\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u6d4b\u8bd5\u4e00\u4e0b\u5982\u679c\u4f7f\u7528\u6bd4\u8f83\u6761\u4ef6\uff0c\u6570\u636e\u5e93\u662f\u5426\u4f1a\u6709\u7c7b\u4f3c\u7684\u8868\u73b0\u3002\u5c1d\u8bd5\u68c0\u7d22\u85aa\u6c34\u4f4e\u4e8e70000\u7684\u5458\u5de5\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE salary <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">70000<\/span><\/mark><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u8fd9\u6b21\u6570\u636e\u5e93\u8fd4\u56de\u4e86\u4e24\u884c\u6570\u636e\uff0c\u5206\u522b\u662fJohn Smith\u548cJane Doe\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n|           2 | Jane       | Doe       | DEF456        |  65000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n8 rows in set (0.000 sec)<\/div><\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5f53\u60a8\u4f7f\u7528EXPLAIN\u6765\u7406\u89e3\u67e5\u8be2\u6267\u884c\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE salary <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">70000<\/span><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u4f60\u4f1a\u6ce8\u610f\u5230\u8fd9\u4e2a\u8868\u4e0e\u4e4b\u524d\u7684\u67e5\u8be2\u51e0\u4e4e\u5b8c\u5168\u76f8\u540c\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n| id | select_type | table     | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n|  1 | SIMPLE      | employees | NULL       | ALL  | <mark>NULL<\/mark>          | <mark>NULL<\/mark> | NULL    | NULL |   <mark>20<\/mark> |    33.33 | <mark>Using where<\/mark> |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n1 row in set, 1 warning (0.00 sec)<\/div><\/code><\/pre>\n<p>\u4e0e\u4e4b\u524d\u7684\u67e5\u8be2\u4e00\u6837\uff0cMySQL\u626b\u63cf\u4e86\u8868\u4e2d\u7684\u6240\u670920\u884c\uff0c\u901a\u8fc7\u67e5\u8be2\u4e2d\u7684WHERE\u5b50\u53e5\u627e\u5230\u4e86\u60a8\u8bf7\u6c42\u7684\u884c\u3002\u5c3d\u7ba1\u8fd4\u56de\u7684\u884c\u6570\u76f8\u5bf9\u4e8e\u8868\u4e2d\u6240\u6709\u884c\u6570\u6765\u8bf4\u5f88\u5c11\uff0c\u4f46\u6570\u636e\u5e93\u5f15\u64ce\u4ecd\u7136\u9700\u8981\u6267\u884c\u5927\u91cf\u7684\u5de5\u4f5c\u6765\u627e\u5230\u5b83\u4eec\u3002<\/p>\n<p>\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u4e3a\u85aa\u8d44\u5217\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15\uff0c\u5b83\u5c06\u544a\u8bc9MySQL\u7ef4\u62a4\u4e00\u4e2a\u989d\u5916\u7684\u3001\u7ecf\u8fc7\u9ad8\u5ea6\u4f18\u5316\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7279\u522b\u9002\u7528\u4e8e\u5458\u5de5\u8868\u4e2d\u7684\u85aa\u8d44\u6570\u636e\u3002\u8981\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">CREATE INDEX <mark>salary<\/mark> ON <mark>employees<span class=\"token punctuation\">(<\/span>salary<span class=\"token punctuation\">)<\/span><\/mark><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u521b\u5efa\u7d22\u5f15\u8bed\u53e5\u7684\u8bed\u6cd5\u9700\u8981\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u7d22\u5f15\u540d\u79f0\uff0c\u5728\u672c\u4f8b\u4e2d\u662fsalary\u3002\u540d\u79f0\u5728\u5355\u4e2a\u8868\u4e2d\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u4f46\u53ef\u4ee5\u5728\u540c\u4e00\u6570\u636e\u5e93\u7684\u4e0d\u540c\u8868\u4e2d\u91cd\u590d\u3002<\/li>\n<li>\u4e3a\u5176\u521b\u5efa\u7d22\u5f15\u7684\u8868\u540d\u3002\u5728\u672c\u4f8b\u4e2d\u662femployees\u3002<\/li>\n<li>\u4e3a\u5176\u521b\u5efa\u7d22\u5f15\u7684\u5217\u5217\u8868\u3002\u8fd9\u91cc\uff0c\u60a8\u4f7f\u7528\u540d\u4e3asalary\u7684\u5355\u4e2a\u5217\u6765\u6784\u5efa\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<div class=\"post-conf-note\">\n<p class=\"post-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<div>\u6839\u636e\u60a8\u7684MySQL\u7528\u6237\u6743\u9650\uff0c\u6267\u884cCREATE INDEX\u547d\u4ee4\u65f6\u53ef\u80fd\u4f1a\u6536\u5230\u9519\u8bef\u63d0\u793a\uff1aERROR 1142 (42000): INDEX\u547d\u4ee4\u88ab\u62d2\u7edd\u5bf9\u7528\u6237&#8217;user&#8217;@&#8217;host&#8217;\u7684&#8217;table &#8217;employees&#8217;\u3002\u4e3a\u4e86\u4e3a\u60a8\u7684\u7528\u6237\u6388\u4e88INDEX\u6743\u9650\uff0c\u8bf7\u4f5c\u4e3aroot\u7528\u6237\u767b\u5f55MySQL\u5e76\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u6839\u636e\u9700\u8981\u66ff\u6362MySQL\u7528\u6237\u540d\u548c\u4e3b\u673a\u540d\uff1a<br \/>GRANT INDEX on *.* TO &#8216;sammy&#8217;@&#8217;localhost&#8217;;<br \/>FLUSH PRIVILEGES;<\/div>\n<p>\u66f4\u65b0\u7528\u6237\u6743\u9650\u540e\uff0c\u4ee5root\u7528\u6237\u8eab\u4efd\u9000\u51fa\u767b\u5f55\uff0c\u5e76\u5c06\u8eab\u4efd\u5207\u6362\u56de\u7528\u6237\uff0c\u5e76\u91cd\u65b0\u8fd0\u884cCREATE INDEX\u8bed\u53e5\u3002<\/p>\n<\/p>\n<\/div>\n<p>\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u7d22\u5f15\u5df2\u6210\u529f\u521b\u5efa\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputQuery OK, 0 rows affected (0.024 sec)\r\nRecords: 0  Duplicates: 0  Warnings: 0<\/div><\/code><\/pre>\n<p>\u6709\u4e86\u7d22\u5f15\u4e4b\u540e\uff0c\u5c1d\u8bd5\u91cd\u590d\u4e4b\u524d\u7684\u67e5\u8be2\u4ee5\u68c0\u67e5\u662f\u5426\u6709\u4efb\u4f55\u53d8\u5316\u3002\u9996\u5148\u68c0\u7d22\u5de5\u8d44\u6b63\u597d\u4e3a100,000\u7684\u5355\u4e2a\u5458\u5de5\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE salary <span class=\"token operator\">=<\/span> <span class=\"token number\">100000<\/span><\/mark><span class=\"token punctuation\">;<\/span><\/li><\/ol><\/code><\/pre>\n<p>\u7ed3\u679c\u5c06\u548c\u4e4b\u524d\u4e00\u6837\uff0c\u53ea\u8fd4\u56deJames Brown\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output<\/div><\/code><\/pre>\n<pre class=\"post-pre\"><code>+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           9 | James      | Brown     | YZA567        | 100000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 \u884c\u7ed3\u679c\u96c6 (<mark>0.000<\/mark> \u79d2)\r\n<\/code><\/pre>\n<p>\u4e0d\u8fc7\uff0c\u8981\u6c42MySQL\u89e3\u91ca\u5b83\u5982\u4f55\u5904\u7406\u67e5\u8be2\u5c06\u4f1a\u663e\u793a\u4e0e\u4e4b\u524d\u6709\u4e9b\u4e0d\u540c\u3002\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u6267\u884cEXPLAIN\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE salary <span class=\"token operator\">=<\/span> <span class=\"token number\">100000<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8fd9\u4e00\u6b21\uff0c\u8f93\u51fa\u5c06\u4f1a\u50cf\u8fd9\u6837\u6253\u5370\u51fa\u6765\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+----+-------------+-----------+------------+------+---------------+--------+---------+-------+------+----------+-------+\r\n| id | select_type | table     | partitions | type | possible_keys | key    | key_len | ref   | rows | filtered | Extra |\r\n+----+-------------+-----------+------------+------+---------------+--------+---------+-------+------+----------+-------+\r\n|  1 | SIMPLE      | employees | NULL       | ref  | <mark>salary<\/mark>        | <mark>salary<\/mark> | 5       | const |    <mark>1<\/mark> |   100.00 | NULL  |\r\n+----+-------------+-----------+------------+------+---------------+--------+---------+-------+------+----------+-------+\r\n1 \u884c\u7ed3\u679c\u96c6, 1 \u4e2a\u8b66\u544a (0.00 \u79d2)\r\n<\/code><\/pre>\n<p>MySQL\u5ba3\u5e03\u4ece\u53ef\u80fd\u7684\u952e\u4e2d\u9009\u62e9\u4e86\u4e00\u4e2a\u540d\u4e3asalary\u7684\u952e\u8fdb\u884c\u4f7f\u7528\uff0c\u8fd9\u4e5f\u5c31\u662f\u4f60\u521b\u5efa\u7684\u7d22\u5f15\u3002\u73b0\u5728\uff0c\u884c\u7684\u5217\u663e\u793a\u4e3a1\u800c\u4e0d\u662f20\u3002\u7531\u4e8e\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u907f\u514d\u4e86\u626b\u63cf\u6240\u6709\u884c\u7684\u64cd\u4f5c\u5e76\u7acb\u5373\u8fd4\u56de\u4e86\u6240\u9700\u7684\u5355\u884c\u6570\u636e\u3002\u73b0\u5728\uff0c\u989d\u5916\u7684\u5217\u4e2d\u4e0d\u518d\u63d0\u53ca\u4f7f\u7528WHERE\uff0c\u56e0\u4e3a\u4e0d\u9700\u8981\u8fed\u4ee3\u4e3b\u8868\u5e76\u68c0\u67e5\u6bcf\u4e00\u884c\u662f\u5426\u7b26\u5408\u67e5\u8be2\u6761\u4ef6\u6765\u6267\u884c\u67e5\u8be2\u3002<\/p>\n<p>\u5728\u4e00\u4e2a\u5c0f\u6837\u672c\u6570\u636e\u96c6\u4e2d\uff0c\u4f7f\u7528\u7d22\u5f15\u7684\u5f71\u54cd\u5e76\u4e0d\u662f\u5f88\u660e\u663e\u3002\u4f46\u662f\u6570\u636e\u5e93\u68c0\u7d22\u7ed3\u679c\u6240\u9700\u7684\u5de5\u4f5c\u91cf\u8981\u5c11\u5f97\u591a\uff0c\u8fd9\u79cd\u6539\u53d8\u5bf9\u4e8e\u4e00\u4e2a\u66f4\u5927\u7684\u6570\u636e\u96c6\u6765\u8bf4\u5c06\u4f1a\u4ea7\u751f\u660e\u663e\u7684\u5f71\u54cd\u3002<\/p>\n<p>\u5c1d\u8bd5\u91cd\u65b0\u8fd0\u884c\u7b2c\u4e8c\u4e2a\u67e5\u8be2\uff0c\u68c0\u7d22\u5de5\u8d44\u4f4e\u4e8e70000\u7684\u5458\u5de5\uff0c\u4ee5\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u4e5f\u4f1a\u5728\u90a3\u91cc\u4f7f\u7528\u3002<\/p>\n<p>\u6267\u884c\u4e0b\u9762\u7684\u67e5\u8be2\u8bed\u53e5\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE salary <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">70000<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u548c\u7b80\u00b7\u591a\u5c06\u8fd4\u56de\u76f8\u540c\u7684\u4e24\u884c\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n|           2 | Jane       | Doe       | DEF456        |  65000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n8 \u884c\u7ed3\u679c\u96c6 (0.000 \u79d2)\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5f53\u60a8\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u8fdb\u884c\u89e3\u91ca\u65f6\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE salary <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">70000<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8fd9\u6b21\u6267\u884c\u540c\u4e00\u67e5\u8be2\u7684\u7ed3\u679c\u5c06\u4e0e\u4e4b\u524d\u7684\u7ed3\u679c\u4e0d\u540c\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+----+-------------+-----------+------------+-------+---------------+--------+---------+------+------+----------+-----------------------+\r\n| id | select_type | table     | partitions | type  | possible_keys | key    | key_len | ref  | rows | filtered | Extra                 |\r\n+----+-------------+-----------+------------+-------+---------------+--------+---------+------+------+----------+-----------------------+\r\n|  1 | SIMPLE      | employees | NULL       | range | <mark>salary<\/mark>        | <mark>salary<\/mark> | 5       | NULL |    2 |   100.00 | <mark>Using index condition<\/mark> |\r\n+----+-------------+-----------+------------+-------+---------------+--------+---------+------+------+----------+-----------------------+\r\n1 \u884c\u7ed3\u679c\u96c6, 1 \u4e2a\u8b66\u544a (0.00 \u79d2)\r\n<\/code><\/pre>\n<p>\u4e3b\u952e\u5217\u663e\u793aMySQL\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u3002 \u5728\u884c\u7684\u65b9\u9762\uff0c\u4ec5\u5206\u6790\u4e24\u884c\u4ee5\u8fd4\u56de\u7ed3\u679c\u3002 \u8fd9\u6b21\uff0c\u9644\u52a0\u5217\u663e\u793a\u4f7f\u7528\u7d22\u5f15\u6761\u4ef6\uff0c\u8fd9\u610f\u5473\u7740\u5728\u8fd9\u79cd\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0cMySQL\u901a\u8fc7\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u8fc7\u6ee4\uff0c\u7136\u540e\u4ec5\u4f7f\u7528\u4e3b\u8868\u68c0\u7d22\u5df2\u5339\u914d\u7684\u884c\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<\/p>\n<\/div>\n<div>\n<p>\u6ce8\u610f\uff1a\u6709\u65f6\u5019\uff0c\u5373\u4f7f\u5b58\u5728\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528\uff0cMySQL\u4e5f\u4f1a\u51b3\u5b9a\u4e0d\u4f7f\u7528\u5b83\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<pre>EXPLAIN SELECT * FROM employees WHERE salary &lt; 140000;<\/pre>\n<p>\u6267\u884c\u8ba1\u5212\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n| id | select_type | table     | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n|  1 | SIMPLE      | employees | NULL       | ALL  | salary        | NULL | NULL    | NULL |   20 |    80.00 | Using where |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n1 row in set, 1 warning (0.00 sec)\r\n  <\/pre>\n<p>\u5c3d\u7ba1possible_keys\u5217\u8868\u4e2d\u5305\u542b\u4e86salary\uff0c\u4f46\u7a7a\u7684key\u5217\uff08\u503c\u4e3aNULL\uff09\u8868\u793aMySQL\u51b3\u5b9a\u4e0d\u4f7f\u7528\u7d22\u5f15\uff0c\u8fd9\u53ef\u4ee5\u901a\u8fc7\u626b\u63cf\u4e8620\u884c\u6765\u786e\u8ba4\u3002\u6570\u636e\u5e93\u67e5\u8be2\u89c4\u5212\u5668\u4f1a\u5206\u6790\u6bcf\u4e2a\u67e5\u8be2\u4ee5\u786e\u5b9a\u6700\u5feb\u7684\u6267\u884c\u8def\u5f84\u3002\u5982\u679c\u8bbf\u95ee\u7d22\u5f15\u7684\u6210\u672c\u8d85\u8fc7\u4e86\u4f7f\u7528\u7d22\u5f15\u7684\u597d\u5904\uff08\u4f8b\u5982\uff0c\u5982\u679c\u67e5\u8be2\u8fd4\u56de\u4e86\u539f\u59cb\u8868\u6570\u636e\u7684\u5f88\u5927\u4e00\u90e8\u5206\uff09\uff0c\u6570\u636e\u5e93\u53ef\u80fd\u51b3\u5b9a\u8fdb\u884c\u5b8c\u6574\u8868\u626b\u63cf\u66f4\u5feb\u3002<\/p>\n<p>\u7c7b\u4f3c\u5730\uff0cExtra\u5217\u4e2d\u7684\u6ce8\u91ca\uff08\u5982Using index condition\u6216Using where\uff09\u66f4\u8be6\u7ec6\u5730\u63cf\u8ff0\u4e86\u6570\u636e\u5e93\u5f15\u64ce\u5982\u4f55\u6267\u884c\u67e5\u8be2\u3002\u6839\u636e\u4e0a\u4e0b\u6587\uff0c\u6570\u636e\u5e93\u53ef\u80fd\u9009\u62e9\u53e6\u4e00\u79cd\u6267\u884c\u67e5\u8be2\u7684\u65b9\u5f0f\uff0c\u53ef\u80fd\u4f1a\u7f3a\u5c11Using index condition\u6ce8\u91ca\uff0c\u6216\u8005\u51fa\u73b0\u5176\u4ed6\u6ce8\u91ca\u3002\u8fd9\u5e76\u4e0d\u610f\u5473\u7740\u7d22\u5f15\u6ca1\u6709\u88ab\u6b63\u786e\u4f7f\u7528\uff0c\u800c\u53ea\u662f\u6570\u636e\u5e93\u51b3\u5b9a\u4ee5\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u8bbf\u95ee\u884c\u3002<\/p>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206\u4e2d\uff0c\u60a8\u521b\u5efa\u5e76\u4f7f\u7528\u5355\u5217\u7d22\u5f15\u6765\u63d0\u9ad8\u5bf9\u4f9d\u8d56\u4e8e\u5bf9\u5355\u4e2a\u5217\u8fdb\u884c\u7b5b\u9009\u7684SELECT\u67e5\u8be2\u7684\u6027\u80fd\u3002\u5728\u4e0b\u4e00\u8282\u4e2d\uff0c\u60a8\u5c06\u63a2\u8ba8\u7d22\u5f15\u5982\u4f55\u7528\u4e8e\u786e\u4fdd\u7ed9\u5b9a\u5217\u4e2d\u7684\u503c\u7684\u552f\u4e00\u6027\u3002<\/p>\n<h2>\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u6765\u9632\u6b62\u6570\u636e\u91cd\u590d<\/h2>\n<p>\u6b63\u5982\u60a8\u5728\u4e0a\u4e00\u8282\u4e2d\u6240\u63a2\u8ba8\u7684\uff0c\u7d22\u5f15\u7684\u4e00\u4e2a\u5e38\u89c1\u7528\u9014\u662f\u901a\u8fc7\u5e2e\u52a9\u6570\u636e\u5e93\u5f15\u64ce\u51cf\u5c11\u5de5\u4f5c\u91cf\u6765\u66f4\u6709\u6548\u5730\u68c0\u7d22\u6570\u636e\u3002\u53e6\u4e00\u4e2a\u76ee\u7684\u662f\u786e\u4fdd\u5728\u5b9a\u4e49\u7d22\u5f15\u7684\u8868\u90e8\u5206\u4e2d\u7684\u6570\u636e\u4e0d\u4f1a\u91cd\u590d\u3002\u8fd9\u5c31\u662f\u552f\u4e00\u7d22\u5f15\u7684\u4f5c\u7528\u3002<\/p>\n<p>\u907f\u514d\u91cd\u590d\u6570\u503c\u901a\u5e38\u662f\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\u800c\u5fc5\u8981\u7684\uff0c\u65e0\u8bba\u662f\u4ece\u903b\u8f91\u8fd8\u662f\u6280\u672f\u7684\u89d2\u5ea6\u6765\u770b\u3002\u4f8b\u5982\uff0c\u4e0d\u5e94\u8be5\u6709\u4e24\u4e2a\u4e0d\u540c\u7684\u4eba\u4f7f\u7528\u76f8\u540c\u7684\u793e\u4f1a\u5b89\u5168\u53f7\u7801\uff0c\u5728\u7ebf\u7cfb\u7edf\u4e5f\u4e0d\u5e94\u8be5\u5141\u8bb8\u591a\u4e2a\u7528\u6237\u4f7f\u7528\u76f8\u540c\u7684\u7528\u6237\u540d\u6216\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u8fdb\u884c\u6ce8\u518c\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u6307\u5357\u4e2d\u7684\u5458\u5de5\u8868\u793a\u4f8b\u4e2d\uff0c\u5206\u914d\u8bbe\u5907\u7684\u5e8f\u5217\u53f7\u662f\u4e00\u4e2a\u4e0d\u5e94\u8be5\u5b58\u5728\u91cd\u590d\u7684\u5b57\u6bb5\u3002\u5982\u679c\u5b58\u5728\u91cd\u590d\uff0c\u8fd9\u5c06\u610f\u5473\u7740\u4e24\u4e2a\u5458\u5de5\u88ab\u5206\u914d\u4e86\u76f8\u540c\u7684\u7535\u8111\u3002\u7136\u800c\uff0c\u5728\u8fd9\u4e00\u70b9\u4e0a\uff0c\u4f60\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u63d2\u5165\u5177\u6709\u91cd\u590d\u5e8f\u5217\u53f7\u7684\u65b0\u5458\u5de5\u3002<\/p>\n<p>\u8bf7\u5c1d\u8bd5\u63d2\u5165\u53e6\u4e00\u540d\u5458\u5de5\uff0c\u5176\u8bbe\u5907\u5e8f\u5217\u53f7\u5df2\u7ecf\u5728\u4f7f\u7528\u4e2d\u3002<\/p>\n<pre>mysql&gt; INSERT INTO employees VALUES (21, 'Sammy', 'Smith', 'ABC123', 65000);<\/pre>\n<p>\u6570\u636e\u5e93\u5c06\u4f9d\u8981\u6c42\u63d2\u5165\u884c\uff0c\u5e76\u901a\u77e5\u60a8\u63d2\u5165\u6210\u529f\u3002<\/p>\n<pre>\r\nOutputQuery OK, 1 row affected (0.009 sec)\r\n  <\/pre>\n<p>\u7136\u800c\uff0c\u5982\u679c\u4f60\u73b0\u5728\u4f7f\u7528ABC123\u7535\u8111\u6765\u67e5\u8be2\u5458\u5de5\u6570\u636e\u5e93\uff1a<\/p>\n<pre>mysql&gt; SELECT * FROM employees WHERE device_serial = 'ABC123';<\/pre>\n<p>\u4f5c\u4e3a\u7ed3\u679c\uff0c\u4f60\u4f1a\u5f97\u5230\u4e24\u4e2a\u4e0d\u540c\u7684\u4eba\u3002<\/p>\n<pre>\r\nOutput+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n|          21 | Sammy      | Smith     | ABC123        |  65000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n2 rows in set (0.000 sec)\r\n  <\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f7f\u5458\u5de5\u6570\u636e\u5e93\u4fdd\u6301\u6709\u6548\u7684\u9884\u671f\u884c\u4e3a\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u5220\u9664\u521a\u521b\u5efa\u7684\u884c\u6765\u64a4\u9500\u8fd9\u4e2a\u66f4\u6539\u3002<\/p>\n<pre>mysql&gt; DELETE FROM employees WHERE employee_id = 21;<\/pre>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7\u91cd\u65b0\u8fd0\u884c\u4e0a\u4e00\u4e2aSELECT\u67e5\u8be2\u6765\u786e\u8ba4\u3002<\/p>\n<pre>mysql&gt; SELECT * FROM employees WHERE device_serial = 'ABC123';<\/pre>\n<p>\u518d\u6b21\uff0c\u53ea\u6709\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u4f7f\u7528\u5e26\u6709\u5e8f\u5217\u53f7ABC123\u7684\u8bbe\u5907\u3002<\/p>\n<pre>\r\nOutput+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 row in set (0.000 sec)\r\n  <\/pre>\n<p>\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u9519\u8bef\u53d1\u751f\uff0c\u53ef\u4ee5\u5728device_serial\u5217\u4e0a\u521b\u5efa\u4e00\u4e2a\u552f\u4e00\u7d22\u5f15\u6765\u4fdd\u62a4\u6570\u636e\u5e93\u3002<\/p>\n<p>\u8981\u8fd9\u6837\u505a\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<pre>mysql&gt; CREATE UNIQUE INDEX device_serial ON employees(device_serial);<\/pre>\n<p>\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u6dfb\u52a0UNIQUE\u5173\u952e\u5b57\u4f1a\u6307\u793a\u6570\u636e\u5e93\u786e\u4fdddevice_serial\u5217\u4e2d\u7684\u503c\u4e0d\u91cd\u590d\u3002\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\uff0c\u6240\u6709\u6dfb\u52a0\u5230\u8868\u4e2d\u7684\u65b0\u884c\u90fd\u4f1a\u4e0e\u7d22\u5f15\u8fdb\u884c\u6bd4\u5bf9\uff0c\u4ee5\u786e\u5b9a\u5217\u503c\u662f\u5426\u6ee1\u8db3\u7ea6\u675f\u6761\u4ef6\u3002<\/p>\n<p>\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u7d22\u5f15\u7684\u521b\u5efa\u3002<\/p>\n<pre>\r\nOutputQuery OK, 0 rows affected (0.021 sec)\r\nRecords: 0  Duplicates: 0  Warnings: 0\r\n  <\/pre>\n<p>\u73b0\u5728\uff0c\u68c0\u67e5\u662f\u5426\u4ecd\u7136\u53ef\u4ee5\u5c06\u91cd\u590d\u7684\u6761\u76ee\u6dfb\u52a0\u5230\u8868\u4e2d\u3002\u5c1d\u8bd5\u518d\u6b21\u8fd0\u884c\u5148\u524d\u6210\u529f\u7684\u63d2\u5165\u67e5\u8be2\u3002<\/p>\n<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u7d22\u5f15\u300b\u7684\u7b2c7\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">INSERT INTO employees VALUES <span class=\"token punctuation\">(<\/span><span class=\"token number\">21<\/span>, <span class=\"token string\">'Sammy'<\/span>, <span class=\"token string\">'Smith'<\/span>, <mark><span class=\"token string\">'ABC123'<\/span><\/mark>, <span class=\"token number\">65000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8fd9\u4e00\u6b21\u4f1a\u663e\u793a\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa\u9519\u8bef 1062 (23000): \u91cd\u590d\u6761\u76ee <mark>'ABC123'<\/mark> \u5bf9\u4e8e\u952e 'device_serial'\r\n<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u518d\u6b21\u4f7f\u7528SELECT\u67e5\u8be2\u6765\u9a8c\u8bc1\u65b0\u884c\u662f\u5426\u672a\u6dfb\u52a0\u5230\u8868\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE device_serial <span class=\"token operator\">=<\/span> <span class=\"token string\">'ABC123'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u8fd4\u56de\u4e86\u4e00\u884c\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 \u884c\u8bb0\u5f55 (0.000 \u79d2)\r\n<\/code><\/pre>\n<p>\u552f\u4e00\u7d22\u5f15\u4e0d\u4ec5\u9632\u6b62\u91cd\u590d\u6761\u76ee\uff0c\u8fd8\u662f\u52a0\u901f\u67e5\u8be2\u7684\u529f\u80fd\u7d22\u5f15\u3002\u6570\u636e\u5e93\u5f15\u64ce\u4f1a\u50cf\u524d\u4e00\u6b65\u9aa4\u4e00\u6837\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\u6765\u9a8c\u8bc1\u8fd9\u4e00\u70b9\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">EXPLAIN SELECT * FROM employees <mark>WHERE device_serial <span class=\"token operator\">=<\/span> <span class=\"token string\">'ABC123'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u6267\u884c\u8ba1\u5212\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u5185\u5bb9\uff08\u60a8\u7684\u8868\u683c\u53ef\u80fd\u4f1a\u7a0d\u6709\u4e0d\u540c\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa+----+-------------+-----------+------------+-------+---------------+---------------+---------+-------+------+----------+-------+\r\n| id | select_type | table     | partitions | type  | possible_keys | key           | key_len | ref   | rows | filtered | Extra |\r\n+----+-------------+-----------+------------+-------+---------------+---------------+---------+-------+------+----------+-------+\r\n|  1 | SIMPLE      | employees | NULL       | const | <mark>device_serial<\/mark> | <mark>device_serial<\/mark> | 63      | const |    <mark>1<\/mark> |   100.00 | NULL  |\r\n+----+-------------+-----------+------------+-------+---------------+---------------+---------+-------+------+----------+-------+\r\n1 \u884c\u8bb0\u5f55, 1 \u4e2a\u8b66\u544a (0.00 \u79d2)\r\n<\/code><\/pre>\n<p>\u8bbe\u5907\u5e8f\u5217\u7d22\u5f15\u5728\u53ef\u80fd\u7684\u952e\u548c\u952e\u5217\u4e2d\u90fd\u663e\u793a\u51fa\u6765\uff0c\u8bc1\u5b9e\u5728\u6267\u884c\u67e5\u8be2\u65f6\u4f7f\u7528\u4e86\u8be5\u7d22\u5f15\u3002<\/p>\n<p>\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u60a8\u4f7f\u7528\u4e86\u552f\u4e00\u7d22\u5f15\u6765\u9632\u6b62\u91cd\u590d\u6570\u636e\u3002\u5728\u4e0b\u4e00\u90e8\u5206\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u8de8\u591a\u5217\u7684\u7d22\u5f15\u3002<\/p>\n<h2>\u4f7f\u7528\u591a\u5217\u7d22\u5f15<\/h2>\n<p>\u76f4\u5230\u73b0\u5728\uff0c\u4f60\u5728\u4e4b\u524d\u7684\u90e8\u5206\u521b\u5efa\u7684\u6240\u6709\u7d22\u5f15\u90fd\u662f\u4f7f\u7528\u5355\u4e2a\u5217\u540d\u6765\u5b9a\u4e49\u7684\uff0c\u6d89\u53ca\u9009\u62e9\u7684\u5217\u7684\u503c\u3002\u5927\u591a\u6570\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301\u8de8\u591a\u4e2a\u5217\u7684\u7d22\u5f15\u3002\u8fd9\u79cd\u79f0\u4e3a\u591a\u5217\u7d22\u5f15\u7684\u7d22\u5f15\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06\u591a\u4e2a\u5217\u7684\u503c\u5b58\u50a8\u5728\u5355\u4e2a\u7d22\u5f15\u4e2d\u7684\u65b9\u5f0f\uff0c\u4ece\u800c\u4f7f\u6570\u636e\u5e93\u5f15\u64ce\u80fd\u591f\u66f4\u5feb\u901f\u9ad8\u6548\u5730\u6267\u884c\u4f7f\u7528\u8fd9\u7ec4\u5217\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u7ecf\u5e38\u9700\u8981\u8fdb\u884c\u6027\u80fd\u4f18\u5316\u7684\u5e38\u7528\u67e5\u8be2\u901a\u5e38\u4f1a\u5728WHERE\u8fc7\u6ee4\u5b50\u53e5\u4e2d\u4f7f\u7528\u591a\u4e2a\u6761\u4ef6\u3002\u8fd9\u79cd\u67e5\u8be2\u7684\u4e00\u4e2a\u4f8b\u5b50\u662f\u901a\u8fc7\u6570\u636e\u5e93\u67e5\u8be2\u540c\u65f6\u6839\u636e\u540d\u5b57\u548c\u59d3\u6c0f\u6765\u627e\u5230\u4e00\u4e2a\u4eba\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE last_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Smith'<\/span> AND first_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'John'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u4f18\u5316\u8fd9\u4e2a\u67e5\u8be2\u7684\u9996\u8981\u60f3\u6cd5\u53ef\u80fd\u662f\u521b\u5efa\u4e24\u4e2a\u5355\u72ec\u7684\u7d22\u5f15\uff0c\u4e00\u4e2a\u5728last_name\u5217\u4e0a\uff0c\u53e6\u4e00\u4e2a\u5728first_name\u5217\u4e0a\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u8fd9\u79cd\u60c5\u51b5\u6765\u8bf4\uff0c\u8fd9\u5e76\u4e0d\u662f\u6700\u597d\u7684\u9009\u62e9\u3002<\/p>\n<p>\u5982\u679c\u60a8\u4ee5\u6b64\u65b9\u5f0f\u521b\u5efa\u4e86\u4e24\u4e2a\u4e0d\u540c\u7684\u7d22\u5f15\uff0cMySQL \u5c06\u77e5\u9053\u5982\u4f55\u627e\u5230\u6240\u6709\u540d\u4e3a Smith \u7684\u5458\u5de5\u3002\u5b83\u4e5f\u5c06\u77e5\u9053\u5982\u4f55\u627e\u5230\u6240\u6709\u540d\u4e3a\u7ea6\u7ff0\u7684\u5458\u5de5\u3002\u7136\u800c\uff0c\u5b83\u5c06\u4e0d\u77e5\u9053\u5982\u4f55\u627e\u5230\u540d\u4e3a\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u7684\u4eba\u3002<\/p>\n<p>\u4e3a\u4e86\u9610\u660e\u5b58\u5728\u4e24\u4e2a\u72ec\u7acb\u7d22\u5f15\u7684\u95ee\u9898\uff0c\u60f3\u8c61\u4e00\u4e0b\u6709\u4e24\u672c\u4e0d\u540c\u7684\u7535\u8bdd\u7c3f\uff0c\u4e00\u672c\u6309\u59d3\u6c0f\u6392\u5e8f\uff0c\u53e6\u4e00\u672c\u6309\u540d\u5b57\u6392\u5e8f\u3002\u8fd9\u4e24\u672c\u7535\u8bdd\u7c3f\u7c7b\u4f3c\u4e8e\u5206\u522b\u57fa\u4e8e\u59d3\u6c0f\u548c\u540d\u5b57\u5217\u521b\u5efa\u7684\u7d22\u5f15\u3002\u4f5c\u4e3a\u4e00\u4e2a\u7535\u8bdd\u7c3f\u7528\u6237\uff0c\u4f60\u53ef\u4ee5\u7528\u4e09\u79cd\u65b9\u5f0f\u6765\u89e3\u51b3\u67e5\u627e\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u7684\u95ee\u9898\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u4f7f\u7528\u6309\u59d3\u6c0f\u6392\u5e8f\u7684\u7535\u8bdd\u7c3f\u627e\u5230\u6240\u6709\u540d\u4e3a\u53f2\u5bc6\u65af\u7684\u4eba\uff0c\u5ffd\u7565\u7b2c\u4e8c\u672c\u7535\u8bdd\u7c3f\uff0c\u7136\u540e\u624b\u52a8\u9010\u4e00\u68c0\u67e5\u6240\u6709\u53f2\u5bc6\u65af\u7684\u4eba\uff0c\u76f4\u5230\u627e\u5230\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u3002<\/li>\n<li>\u76f8\u53cd\u7684\u505a\u6cd5\uff1a\u4f7f\u7528\u6309\u540d\u5b57\u6392\u5e8f\u7684\u7535\u8bdd\u7c3f\u627e\u5230\u6240\u6709\u540d\u4e3a\u7ea6\u7ff0\u7684\u4eba\uff0c\u5ffd\u7565\u7b2c\u4e8c\u672c\u7535\u8bdd\u7c3f\uff0c\u7136\u540e\u624b\u52a8\u9010\u4e00\u68c0\u67e5\u6240\u6709\u7ea6\u7ff0\u7684\u4eba\uff0c\u76f4\u5230\u627e\u5230\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u3002<\/li>\n<li>\u5c1d\u8bd5\u540c\u65f6\u4f7f\u7528\u4e24\u672c\u7535\u8bdd\u7c3f\uff1a\u5206\u522b\u627e\u5230\u6240\u6709\u540d\u4e3a\u7ea6\u7ff0\u7684\u4eba\u548c\u6240\u6709\u540d\u4e3a\u53f2\u5bc6\u65af\u7684\u4eba\uff0c\u8bb0\u4e0b\u4e2d\u95f4\u7ed3\u679c\uff0c\u7136\u540e\u5c1d\u8bd5\u624b\u52a8\u4ea4\u53c9\u8fd9\u4e24\u4e2a\u6570\u636e\u5b50\u96c6\uff0c\u5bfb\u627e\u540c\u65f6\u5728\u4e24\u4e2a\u5355\u72ec\u5217\u8868\u4e2d\u7684\u4eba\u3002<\/li>\n<\/ul>\n<p>\u6240\u6709\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u4e0d\u7406\u60f3\uff0c\u5e76\u4e14\u5728\u5904\u7406\u591a\u4e2a\u4e0d\u76f8\u5173\u7d22\u5f15\u548c\u5305\u542b\u591a\u4e2a\u8fc7\u6ee4\u6761\u4ef6\u7684\u67e5\u8be2\u65f6\uff0cMySQL\u4e5f\u6709\u7c7b\u4f3c\u7684\u9009\u62e9\u3002<\/p>\n<p>\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u7d22\u5f15\uff0c\u8fd9\u4e9b\u7d22\u5f15\u4e0d\u4ec5\u8003\u8651\u5355\u5217\uff0c\u8fd8\u8003\u8651\u591a\u5217\u3002\u4f60\u53ef\u4ee5\u628a\u5b83\u60f3\u8c61\u6210\u4e00\u4e2a\u653e\u7f6e\u5728\u53e6\u4e00\u4e2a\u7535\u8bdd\u7c3f\u4e2d\u7684\u7535\u8bdd\u7c3f\uff1a\u9996\u5148\u4f60\u67e5\u627e\u59d3\u6c0f\u4e3a\u53f2\u5bc6\u65af\u7684\u4eba\uff0c\u5728\u7b2c\u4e8c\u4e2a\u76ee\u5f55\u4e2d\u6309\u7167\u540d\u5b57\u7684\u5b57\u6bcd\u987a\u5e8f\u7ec4\u7ec7\uff0c\u4f60\u53ef\u4ee5\u7528\u5b83\u5feb\u901f\u627e\u5230\u7ea6\u7ff0\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<\/p>\n<div>\u5e38\u8a00\u9053MySQL\u6bcf\u4e2a\u4f7f\u7528\u5728\u67e5\u8be2\u4e2d\u7684\u8868\u53ea\u80fd\u4f7f\u7528\u4e00\u4e2a\u7d22\u5f15\u3002\u867d\u7136\u8fd9\u5e76\u4e0d\u603b\u662f\u6b63\u786e\u7684\uff0c\u56e0\u4e3aMySQL\u652f\u6301\u7d22\u5f15\u5408\u5e76\u4f18\u5316\u6765\u540c\u65f6\u4f7f\u7528\u591a\u4e2a\u7d22\u5f15\u8fd0\u884c\u67e5\u8be2\u3002\u7136\u800c\uff0c\u8fd9\u4e2a\u9650\u5236\u5728\u6784\u5efa\u7d22\u5f15\u65f6\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u7ecf\u9a8c\u6cd5\u5219\u3002MySQL\u53ef\u80fd\u51b3\u5b9a\u4e0d\u4f7f\u7528\u591a\u4e2a\u7d22\u5f15\uff1b\u5373\u4f7f\u5b83\u4f7f\u7528\u4e86\u591a\u4e2a\u7d22\u5f15\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u5b83\u4eec\u4e5f\u4e0d\u4f1a\u50cf\u4e13\u7528\u7d22\u5f15\u4e00\u6837\u6709\u6548\u3002<\/div>\n<\/div>\n<p>\u5728MySQL\u4e2d\uff0c\u4e3a\u5458\u5de5\u8868\u7684\u59d3\u548c\u540d\u521b\u5efa\u4e00\u4e2a\u591a\u5217\u7d22\u5f15\uff0c\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">CREATE INDEX <mark>names<\/mark> ON <mark>employees<span class=\"token punctuation\">(<\/span>last_name, first_name<span class=\"token punctuation\">)<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cCREATE INDEX\u8bed\u53e5\u7a0d\u6709\u4e0d\u540c\u3002\u73b0\u5728\u5728\u8868\u540d\uff08employees\uff09\u540e\u7684\u62ec\u53f7\u4e2d\uff0c\u5217\u51fa\u4e86\u4e24\u5217\uff1alast_name\u548cfirst_name\u3002\u8fd9\u5c06\u5728\u8fd9\u4e24\u5217\u4e0a\u521b\u5efa\u4e00\u4e2a\u591a\u5217\u7d22\u5f15\u3002\u7d22\u5f15\u5b9a\u4e49\u4e2d\u5217\u51fa\u7684\u5217\u7684\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u4f60\u9a6c\u4e0a\u5c31\u4f1a\u53d1\u73b0\u3002<\/p>\n<p>\u6570\u636e\u5e93\u5c06\u663e\u793a\u4ee5\u4e0b\u6d88\u606f\uff0c\u786e\u8ba4\u5df2\u6210\u529f\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputQuery OK, 0 rows affected (0.024 sec)\r\nRecords: 0  Duplicates: 0  Warnings: 0\r\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u8bf7\u5c1d\u8bd5\u53d1\u51faSELECT\u67e5\u8be2\uff0c\u67e5\u627e\u540d\u5b57\u4e3aJohn\u4e14\u59d3\u6c0f\u4e3aSmith\u7684\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE last_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Smith'<\/span> AND first_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'John'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\u662f\u4e00\u4e2a\u5305\u542b\u5458\u5de5\u540d\u4e3a\u7ea6\u7ff0\u00b7\u53f2\u5bc6\u65af\u7684\u5355\u884c\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 row in set (0.000 sec)\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u4f7f\u7528EXPLAIN\u67e5\u8be2\u6765\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u88ab\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE last_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Smith'<\/span> AND first_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'John'<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u6267\u884c\u8ba1\u5212\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u5185\u5bb9\uff08\u4f60\u7684\u8868\u53ef\u80fd\u7565\u6709\u4e0d\u540c\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+----+-------------+-----------+------------+------+---------------+-------+---------+-------------+------+----------+-------+\r\n| id | select_type | table     | partitions | type | possible_keys | key   | key_len | ref         | rows | filtered | Extra |\r\n+----+-------------+-----------+------------+------+---------------+-------+---------+-------------+------+----------+-------+\r\n|  1 | SIMPLE      | employees | NULL       | ref  | <mark>names<\/mark>         | <mark>names<\/mark> | 406     | const,const |    <mark>1<\/mark> |   100.00 | NULL  |\r\n+----+-------------+-----------+------------+------+---------------+-------+---------+-------------+------+----------+-------+\r\n1 row in set, 1 warning (0.00 sec)\r\n<\/code><\/pre>\n<p>\u6570\u636e\u5e93\u4f7f\u7528\u4e86\u540d\u79f0\u7d22\u5f15\u3002\u626b\u63cf\u4e86\u4e00\u884c\u6570\u636e\uff0c\u56e0\u6b64\u8868\u683c\u6ca1\u6709\u591a\u4f59\u5730\u88ab\u904d\u5386\u3002\u989d\u5916\u5217\u663e\u793a\u4e86\u201c\u4f7f\u7528\u7d22\u5f15\u6761\u4ef6\u201d\uff0c\u8fd9\u610f\u5473\u7740MySQL\u53ef\u4ee5\u4ec5\u4f7f\u7528\u7d22\u5f15\u5b8c\u6210\u8fc7\u6ee4\u3002<\/p>\n<p>\u4f7f\u7528\u8de8\u8d8a\u8fd9\u4e24\u5217\u7684\u591a\u5217\u7d22\u5f15\u5bf9\u59d3\u548c\u540d\u8fdb\u884c\u8fc7\u6ee4\uff0c\u4e3a\u6570\u636e\u5e93\u63d0\u4f9b\u4e86\u4e00\u4e2a\u76f4\u63a5\u4e14\u5feb\u901f\u7684\u65b9\u5f0f\u6765\u67e5\u627e\u6240\u9700\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u5982\u679c\u5728\u4e24\u5217\u4e0a\u5b9a\u4e49\u4e86\u7d22\u5f15\uff0c\u5982\u679c\u4f60\u5c1d\u8bd5\u67e5\u627e\u6240\u6709\u540d\u5b57\u4e3aSmith\u7684\u5458\u5de5\uff0c\u4f46\u4e0d\u6839\u636e\u540d\u5b57\u8fdb\u884c\u7b5b\u9009\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\uff1f\u8fd0\u884c\u4fee\u6539\u540e\u7684\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE last_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Smith'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|          20 | Abigail    | Smith     | FGH890        | 155000 |\r\n|          17 | Daniel     | Smith     | WXY901        | 140000 |\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n|           5 | Michael    | Smith     | MNO345        |  80000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n4 rows in set (0.000 sec)\r\n<\/code><\/pre>\n<p>\u6709\u56db\u4e2a\u5458\u5de5\u59d3\u53f2\u5bc6\u65af\u3002<\/p>\n<p>\u518d\u6b21\u8bbf\u95ee\u67e5\u8be2\u6267\u884c\u8ba1\u5212\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE last_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Smith'<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u6267\u884c\u8ba1\u5212\u5c06\u7c7b\u4f3c\u4e8e\u4e0b\u9762\u7684\uff08\u60a8\u7684\u8868\u53ef\u80fd\u4f1a\u7565\u6709\u4e0d\u540c\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+----+-------------+-----------+------------+------+---------------+-------+---------+-------+------+----------+-------+\r\n| id | select_type | table     | partitions | type | possible_keys | key   | key_len | ref   | rows | filtered | Extra |\r\n+----+-------------+-----------+------------+------+---------------+-------+---------+-------+------+----------+-------+\r\n|  1 | SIMPLE      | employees | NULL       | ref  | <mark>names<\/mark>         | <mark>names<\/mark> | 203     | const |    <mark>4<\/mark> |   100.00 | NULL  |\r\n+----+-------------+-----------+------------+------+---------------+-------+---------+-------+------+----------+-------+\r\n1 row in set, 1 warning (0.01 sec)\r\n<\/code><\/pre>\n<p>\u8fd9\u6b21\u8fd4\u56de\u4e86\u56db\u884c\u7ed3\u679c\uff0c\u56e0\u4e3a\u6709\u591a\u4e2a\u5458\u5de5\u5177\u6709\u76f8\u540c\u7684\u59d3\u6c0f\u3002\u7136\u800c\uff0c\u6267\u884c\u8ba1\u5212\u8868\u663e\u793a\u6570\u636e\u5e93\u4f7f\u7528\u4e86\u591a\u5217\u7d22\u5f15\u540d\u6765\u6267\u884c\u6b64\u67e5\u8be2\uff0c\u4ec5\u626b\u63cf\u4e864\u884c &#8211; \u5373\u8fd4\u56de\u7ed3\u679c\u7684\u51c6\u786e\u6570\u91cf\u3002<\/p>\n<p>\u5728\u4e4b\u524d\u7684\u67e5\u8be2\u4e2d\uff0c\u7528\u4e8e\u8fc7\u6ee4\u7ed3\u679c\u7684\u5217\uff08last_name\uff09\u5728CREATE INDEX\u8bed\u53e5\u4e2d\u9996\u5148\u4f20\u9012\u3002\u73b0\u5728\uff0c\u60a8\u5c06\u901a\u8fc7first_name\u6765\u8fc7\u6ee4employees\u8868\uff0c\u800c\u8fd9\u662f\u591a\u5217\u7d22\u5f15\u4e2d\u5217\u5217\u8868\u4e2d\u7684\u7b2c\u4e8c\u4e2a\u5217\u3002\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SELECT * FROM employees <mark>WHERE first_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'John'<\/span><\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u5c06\u4f1a\u8fd4\u56de\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+-------------+------------+-----------+---------------+--------+\r\n| employee_id | first_name | last_name | device_serial | salary |\r\n+-------------+------------+-----------+---------------+--------+\r\n|           1 | John       | Smith     | ABC123        |  60000 |\r\n+-------------+------------+-----------+---------------+--------+\r\n1 row in set (0.000 sec)\r\n\r\n<\/code><\/pre>\n<p>\u8bbf\u95ee\u67e5\u8be2\u6267\u884c\u8ba1\u5212<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\"><mark>EXPLAIN<\/mark> SELECT * FROM employees WHERE first_name <span class=\"token operator\">=<\/span> <span class=\"token string\">'John'<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u5c06\u5982\u4e0b\u8fd4\u56de\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n| id | select_type | table     | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n|  1 | SIMPLE      | employees | NULL       | ALL  | <mark>NULL<\/mark>          | <mark>NULL<\/mark> | NULL    | NULL |   <mark>20<\/mark> |    10.00 | Using where |\r\n+----+-------------+-----------+------------+------+---------------+------+---------+------+------+----------+-------------+\r\n1 row in set, 1 warning (0.00 sec)\r\n<\/code><\/pre>\n<p>\u518d\u6b21\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u4e2d\u53ea\u5305\u542b\u4e00\u4e2a\u5458\u5de5\uff0c\u4f46\u8fd9\u6b21\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\u3002\u6570\u636e\u5e93\u626b\u63cf\u4e86\u6574\u4e2a\u8868\uff0c\u8fd9\u53ef\u4ee5\u901a\u8fc7Extra\u5217\u4e2d\u7684Using where\u6ce8\u91ca\u4ee5\u53ca\u626b\u63cf\u4e8620\u884c\u6765\u8bf4\u660e\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7531\u4e8e\u5728\u9996\u6b21\u521b\u5efa\u7d22\u5f15\u65f6\u4f20\u9012\u7ed9CREATE INDEX\u8bed\u53e5\u7684\u5217\u7684\u987a\u5e8f\uff1alast_name\uff0cfirst_name\uff0c\u5bfc\u81f4\u6570\u636e\u5e93\u672a\u4f7f\u7528\u7d22\u5f15\u3002\u53ea\u6709\u5728\u67e5\u8be2\u4f7f\u7528\u7b2c\u4e00\u5217\u6216\u540c\u65f6\u4f7f\u7528\u7b2c\u4e00\u5217\u548c\u7b2c\u4e8c\u5217\u65f6\uff0c\u6570\u636e\u5e93\u624d\u80fd\u4f7f\u7528\u6b64\u7d22\u5f15\uff1b\u5982\u679c\u7d22\u5f15\u5b9a\u4e49\u4e2d\u7684\u7b2c\u4e00\u5217\u672a\u88ab\u67e5\u8be2\u4f7f\u7528\uff0c\u5b83\u65e0\u6cd5\u652f\u6301\u5bf9\u7d22\u5f15\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u901a\u8fc7\u5728\u591a\u5217\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u6765\u52a0\u901f\u6d89\u53ca\u5230\u6240\u6709\u7d22\u5f15\u5217\u6216\u5de6\u4fa7\u524d\u7f00\u9010\u6e10\u589e\u957f\u7684\u67e5\u8be2\u3002\u4f8b\u5982\uff0c\u5305\u62ec\u5217\uff08a\uff0cb\uff0cc\uff09\u7684\u591a\u5217\u7d22\u5f15\u53ef\u4ee5\u7528\u6765\u52a0\u901f\u6d89\u53ca\u5230\u6240\u6709\u4e09\u5217\u7684\u67e5\u8be2\uff0c\u6d89\u53ca\u5230\u524d\u4e24\u5217\u7684\u67e5\u8be2\uff0c\u751a\u81f3\u4ec5\u6d89\u53ca\u7b2c\u4e00\u5217\u7684\u67e5\u8be2\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u7d22\u5f15\u65e0\u6cd5\u5e2e\u52a9\u53ea\u6d89\u53ca\u6700\u540e\u4e00\u5217c\u6216\u6700\u540e\u4e24\u5217b\u548cc\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u901a\u8fc7\u4ed4\u7ec6\u9009\u62e9\u5305\u62ec\u5728\u7d22\u5f15\u4e2d\u7684\u5217\u53ca\u5176\u987a\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528\u5355\u4e2a\u591a\u5217\u7d22\u5f15\u6765\u52a0\u5feb\u5bf9\u540c\u4e00\u5f20\u8868\u7684\u5404\u79cd\u67e5\u8be2\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5047\u8bbe\u6211\u4eec\u6309\u7167\u540d\u5b57\u548c\u59d3\u6c0f\u6765\u67e5\u627e\u5458\u5de5\uff0c\u6216\u8005\u4ec5\u6309\u7167\u59d3\u6c0f\u6765\u67e5\u627e\u5458\u5de5\uff0c\u5728\u540d\u5b57\u7d22\u5f15\u4e2d\u63d0\u4f9b\u7684\u5217\u7684\u987a\u5e8f\u4fdd\u8bc1\u4e86\u8be5\u7d22\u5f15\u5c06\u52a0\u901f\u6240\u6709\u76f8\u5173\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u4f7f\u7528\u4e86\u591a\u5217\u7d22\u5f15\uff0c\u5e76\u5b66\u4e60\u4e86\u5728\u6307\u5b9a\u6b64\u7c7b\u7d22\u5f15\u65f6\u7684\u5217\u987a\u5e8f\u3002\u5728\u4e0b\u4e00\u8282\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u5982\u4f55\u7ba1\u7406\u73b0\u6709\u7684\u7d22\u5f15\u3002<\/p>\n<h2>\u5217\u51fa\u548c\u5220\u9664\u5df2\u5b58\u5728\u7684\u7d22\u5f15<\/p>\n<p>\u5728\u4e4b\u524d\u7684\u90e8\u5206\u4e2d\uff0c\u60a8\u521b\u5efa\u4e86\u65b0\u7684\u7d22\u5f15\u3002\u7531\u4e8e\u7d22\u5f15\u5177\u6709\u540d\u79f0\u5e76\u4e14\u662f\u5728\u7279\u5b9a\u7684\u8868\u4e0a\u5b9a\u4e49\u7684\uff0c\u5f53\u9700\u8981\u65f6\u60a8\u8fd8\u53ef\u4ee5\u5217\u51fa\u5b83\u4eec\u5e76\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\uff0c\u5217\u51fa\u4f60\u521b\u5efa\u7684\u6240\u6709\u7528\u4e8e\u5458\u5de5\u8868\u7684\u7d22\u5f15\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\u3002<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">SHOW INDEXES FROM <mark>employees<\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">Output+-----------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+\r\n| Table     | Non_unique | Key_name      | Seq_in_index | Column_name   | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression |\r\n+-----------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+\r\n| employees |          0 | device_serial |            1 | device_serial | A         |          20 |     NULL |   NULL | YES  | BTREE      |         |               | YES     | NULL       |\r\n| employees |          1 | salary        |            1 | salary        | A         |          20 |     NULL |   NULL | YES  | BTREE      |         |               | YES     | NULL       |\r\n| employees |          1 | names         |            1 | last_name     | A         |          16 |     NULL |   NULL | YES  | BTREE      |         |               | YES     | NULL       |\r\n| employees |          1 | names         |            2 | first_name    | A         |          20 |     NULL |   NULL | YES  | BTREE      |         |               | YES     | NULL       |\r\n+-----------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+\r\n4 rows in set (0.01 sec)\r\n<\/code><\/pre>\n<p>\u6839\u636e\u60a8\u4f7f\u7528\u7684MySQL\u7248\u672c\uff0c\u8f93\u51fa\u7ed3\u679c\u53ef\u80fd\u4f1a\u7a0d\u6709\u4e0d\u540c\uff0c\u4f46\u5b83\u5c06\u5305\u62ec\u6240\u6709\u7d22\u5f15\uff0c\u5305\u62ec\u7d22\u5f15\u7684\u540d\u79f0\u3001\u5b9a\u4e49\u7d22\u5f15\u7684\u5217\u3001\u5173\u4e8e\u5176\u552f\u4e00\u6027\u7684\u4fe1\u606f\u4ee5\u53ca\u7d22\u5f15\u5b9a\u4e49\u7684\u5176\u4ed6\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<p>\u8981\u5220\u9664\u73b0\u6709\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528DROP INDEX SQL\u8bed\u53e5\u3002\u5047\u8bbe\u60a8\u4e0d\u518d\u60f3\u5bf9device_serial\u5217\u5f3a\u5236\u6267\u884c\u552f\u4e00\u6027\u7ea6\u675f\u3002\u56e0\u6b64\uff0c\u8bbe\u5907\u5e8f\u5217\u53f7\u7d22\u5f15\u5c06\u4e0d\u518d\u9700\u8981\u3002\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre class=\"post-pre\"><code><ol><li data-prefix=\"mysql>\">DROP INDEX <mark>device_serial<\/mark> ON <mark>employees<\/mark><span class=\"token punctuation\">;<\/span>\r\n<\/li><\/ol>\r\n<\/code><\/pre>\n<p>\u8bbe\u5907\u5e8f\u5217\u662f\u7d22\u5f15\u540d\u79f0\uff0c\u96c7\u5458\u662f\u5b9a\u4e49\u4e86\u8be5\u7d22\u5f15\u7684\u8868\u3002\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u7d22\u5f15\u5220\u9664\u3002<\/p>\n<pre class=\"post-pre\"><code><div class=\"secondary-code-label\" title=\"Output\">OutputQuery OK, 0 rows affected (0.018 sec)\r\nRecords: 0  Duplicates: 0  Warnings: 0\r\n<\/code><\/pre>\n<p>\u6709\u65f6\u5019\uff0c\u5178\u578b\u67e5\u8be2\u7684\u6a21\u5f0f\u4f1a\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u53d8\u5316\uff0c\u6216\u8005\u65b0\u7684\u67e5\u8be2\u7c7b\u578b\u4f1a\u53d8\u5f97\u7a81\u51fa\u3002\u7136\u540e\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u8bc4\u4f30\u5df2\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u521b\u5efa\u65b0\u7684\u7d22\u5f15\uff0c\u6216\u8005\u5220\u9664\u672a\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u4ee5\u4fdd\u6301\u5b83\u4eec\u7684\u6700\u65b0\u72b6\u6001\uff0c\u907f\u514d\u964d\u4f4e\u6570\u636e\u5e93\u6027\u80fd\u3002<\/p>\n<p>\u901a\u8fc7\u4f7f\u7528CREATE INDEX\u548cDROP 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