{"id":50663,"date":"2022-12-16T03:59:56","date_gmt":"2023-07-25T11:05:29","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/sql%e8%a1%a8%e8%be%be%e5%bc%8f\/"},"modified":"2024-04-29T05:31:27","modified_gmt":"2024-04-28T21:31:27","slug":"sql%e8%a1%a8%e8%be%be%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/sql%e8%a1%a8%e8%be%be%e5%bc%8f\/","title":{"rendered":"SQL\u8868\u8fbe\u5f0f"},"content":{"rendered":"<p>SQL\u8868\u8fbe\u5f0f\u662f\u7531\u4e00\u4e2a\u6216\u591a\u4e2a\u503c\u3001\u8fd0\u7b97\u7b26\u548cSQL\u51fd\u6570\u7ec4\u5408\u800c\u6210\u7684\uff0c\u6700\u7ec8\u5f97\u5230\u4e00\u4e2a\u503c\u3002\u8fd9\u4e9bSQL\u8868\u8fbe\u5f0f\u7c7b\u4f3c\u4e8e\u516c\u5f0f\uff0c\u5b83\u4eec\u5728\u67e5\u8be2\u8bed\u8a00\u4e2d\u7f16\u5199\u3002\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u6765\u67e5\u8be2\u7279\u5b9a\u7684\u6570\u636e\u96c6\u3002<\/p>\n<h2>SQL\u8868\u8fbe\u5f0f<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656474fba4b2f92e6c729f2c\/2-0.png\" alt=\"SQL Expressions\" \/><\/div>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5e03\u5c14\u578b<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6570\u5b57\u578b<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u65e5\u671f\u578b<\/ol>\n<p>\u8ba9\u6211\u4eec\u8bd5\u7740\u901a\u8fc7\u793a\u4f8b\u7a0b\u5e8f\u8be6\u7ec6\u4e86\u89e3\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u3002<\/p>\n<h3>SQL \u5e03\u5c14\u8868\u8fbe\u5f0f\uff1a<\/h3>\n<p>SQL\u5e03\u5c14\u8868\u8fbe\u5f0f\u6839\u636eSQL\u67e5\u8be2\u4e2d\u6240\u63d0\u5230\u7684\u6761\u4ef6\u6765\u83b7\u53d6\u6570\u636e\u3002\u5f53\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u5b83\u5e94\u8be5\u53ea\u83b7\u53d6\u4e00\u4e2a\u5355\u503c\u3002\u5176\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>SELECT column \r\nFROM table_name \r\nWHERE SINGLE_VALUE_MATCHING_EXPRESSION;\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528\u5e26\u6709\u4e00\u4e9b\u6570\u636e\u7684\u793a\u4f8b\u8868\u683c\u6765\u7406\u89e3\u5e03\u5c14\u8868\u8fbe\u5f0f\u3002<\/p>\n<div>\n<div class=\"post-table\">\n<table>\n<thead>\n<tr>\n<th>EmpId<\/th>\n<th>EmpName<\/th>\n<th>EmpAge<\/th>\n<th>EmpSalary<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>John<\/td>\n<td>32<\/td>\n<td>2000<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>Smith<\/td>\n<td>25<\/td>\n<td>2500<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Henry<\/td>\n<td>29<\/td>\n<td>3000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>\u6211\u4eec\u5c06\u4ee5\u4e0a\u8ff0\u63d0\u5230\u7684\u5458\u5de5\u8868\u4e3a\u4f8b\u3002\u793a\u4f8b\u67e5\u8be2\uff1a<\/p>\n<pre class=\"post-pre\"><code>SELECT EmpName FROM Employee WHERE EmpId = 1;\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u67e5\u8be2\u5c06\u5bfc\u81f4\u5355\u4e2a\u503c\uff0c\u5373\u6211\u4eec\u7684\u67e5\u8be2\u7ed3\u679c\u4e3a\u201cJohn\u201d\u3002SQL\u5e03\u5c14\u8868\u8fbe\u5f0f\u5e94\u4e0e\u4e3b\u952e\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u786e\u4fdd\u59cb\u7ec8\u53ea\u83b7\u53d6\u4e00\u4e2a\u7ed3\u679c\u3002\u8fd9\u5728\u5d4c\u5957\u7684SQL\u9009\u62e9\u67e5\u8be2\u4e2d\u662f\u5fc5\u9700\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>select posts.title, posts.author_id from posts, authors \r\nwhere posts.author_id = authors.id and \r\nposts.author_id = (select id from authors where name = 'Pankaj');\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7684\u67e5\u8be2\u5c06\u8fd4\u56de\u6240\u6709\u5e16\u5b50\u540d\u79f0\u548cID\uff0c\u5176\u4e2d\u4f5c\u8005\u540d\u79f0\u4e3aPankaj\u3002\u5728\u6b64\u5d4c\u5957\u7684SQL\u67e5\u8be2\u4e2d\uff0c\u5e94\u59cb\u7ec8\u53ea\u8fd4\u56de\u4e00\u884c\uff0c\u5426\u5219\u5c06\u51fa\u73b0\u9519\u8bef\u6d88\u606f\uff0c\u5373\u5b50\u67e5\u8be2\u8fd4\u56de\u591a\u4e8e1\u884c\u3002<\/p>\n<h3>SQL \u6570\u503c\u8868\u8fbe\u5f0f<\/h3>\n<p>\u5728SQL\u67e5\u8be2\u4e2d\uff0c\u4f7f\u7528SQL\u6570\u5b57\u8868\u8fbe\u5f0f\u6765\u6267\u884c\u6570\u5b66\u8fd0\u7b97\u3002\u5176\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>SELECT NUMERICAL_EXPRESSION as OPERATION_NAME\r\nFROM table_name\r\n<\/code><\/pre>\n<p>NUMERICAL_EXPRESSION\u662fSQL\u67e5\u8be2\u4e2d\u5c06\u8981\u4f7f\u7528\u7684\u51fd\u6570\u7684\u6570\u5b66\u516c\u5f0f\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u6765\u8bd5\u7740\u7406\u89e3\u6570\u503c\u8868\u8fbe\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT count(*) FROM Employee; -- 3\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8be2\u7ed3\u679c\u5c06\u4f1a\u662f3\uff0c\u56e0\u4e3aCOUNT(*)\u51fd\u6570\u5c06\u6839\u636eWHERE\u5b50\u53e5\u4e2d\u7684\u6761\u4ef6\u63d0\u4f9b\u884c\u7684\u603b\u8ba1\u6570\u3002\u4f8b\u5982\uff0c\u4eceemployee\u8868\u4e2d\u9009\u62e9count(*) where empsalary &gt; 2400; \u5c06\u8fd4\u56de2\u3002\u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u51fd\u6570\uff0c\u6bd4\u5982sum()\u3001avg()\u3001min()\u3001max()\u7b49\uff0c\u8fd9\u4e9b\u51fd\u6570\u7528\u4e8e\u6570\u5b66\u8fd0\u7b97\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e9bSQL\u6570\u503c\u8868\u8fbe\u5f0f\u7684\u66f4\u591a\u793a\u4f8b\u4ee3\u7801\u7247\u6bb5\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT sum(EmpSalary) as \"Salary\" FROM Employee; -- 7500\r\nselect min(EmpSalary) from Employee; -- 2000\r\nselect max(EmpSalary) from Employee; -- 3000\r\nselect sum(EmpSalary) from Employee; -- 7500\r\nselect avg(EmpSalary) from Employee; -- 2500.0000\r\n<\/code><\/pre>\n<h3>SQL\u65e5\u671f\u8868\u8fbe\u5f0f<\/h3>\n<p>SQL\u65e5\u671f\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u662f\u65e5\u671f\u65f6\u95f4\u503c\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e9bSQL\u8bed\u53e5\u6765\u7406\u89e3\u65e5\u671f\u8868\u8fbe\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT CURRENT_TIMESTAMP; -- 2018-01-20 10:32:37\r\n\r\n-- For MYQSL\r\nSELECT now(); -- 2018-01-20 10:32:57\r\n\r\n-- For SQL Server\r\nSELECT GetDate();\r\n\r\n-- For Oracle DB\r\nselect sysdate from Dual; -- 20-JAN-18\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8be2\u5c06\u5bfc\u81f4\u7cfb\u7edf\u7684\u5f53\u524d\u65f6\u95f4\u3002\u8bf7\u6ce8\u610f\uff0c\u6bcf\u4e2a\u5173\u7cfb\u6570\u636e\u5e93\u4f9b\u5e94\u5546\u90fd\u6709\u7279\u5b9a\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u6233\u503c\uff0c\u56e0\u6b64\u5b58\u5728\u4e00\u4e2a\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u4e2a\u51fd\u6570\u5728\u53e6\u4e00\u4e2a\u6570\u636e\u5e93\u4e2d\u4e0d\u8d77\u4f5c\u7528\u7684\u53ef\u80fd\u6027\u3002\u5173\u4e8eSQL\u8868\u8fbe\u5f0f\u7684\u5168\u90e8\u5185\u5bb9\uff0c\u6211\u4eec\u5c06\u5728\u540e\u9762\u7684SQL\u6559\u7a0b\u548c\u7a0b\u5e8f\u4e2d\u7ecf\u5e38\u4f7f\u7528\u5b83\u4eec\u3002\u8fdb\u4e00\u6b65\u9605\u8bfb\uff1aSQL\u6570\u636e\u7c7b\u578b\u3002\u53c2\u8003\u8d44\u6599\uff1aOracle\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQL\u8868\u8fbe\u5f0f\u662f\u7531\u4e00\u4e2a\u6216\u591a\u4e2a\u503c\u3001\u8fd0\u7b97\u7b26\u548cSQL\u51fd\u6570\u7ec4\u5408\u800c\u6210\u7684\uff0c\u6700\u7ec8\u5f97\u5230\u4e00\u4e2a\u503c\u3002\u8fd9\u4e9bSQL\u8868\u8fbe\u5f0f\u7c7b\u4f3c\u4e8e\u516c\u5f0f\uff0c\u5b83\u4eec\u5728 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50663","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL\u8868\u8fbe\u5f0f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/sql\u8868\u8fbe\u5f0f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL\u8868\u8fbe\u5f0f\" \/>\n<meta property=\"og:description\" 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