{"id":41403,"date":"2023-11-27T03:32:40","date_gmt":"2024-01-15T20:23:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql%e5%85%b3%e4%ba%8ejoin%e7%9a%84%e5%86%85%e5%ae%b9\/"},"modified":"2024-05-04T10:58:27","modified_gmt":"2024-05-04T02:58:27","slug":"postgresql%e5%85%b3%e4%ba%8ejoin%e7%9a%84%e5%86%85%e5%ae%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql%e5%85%b3%e4%ba%8ejoin%e7%9a%84%e5%86%85%e5%ae%b9\/","title":{"rendered":"[PostgreSQL]\u5173\u4e8eJOIN\u7684\u5185\u5bb9"},"content":{"rendered":"<p>\u4ee5\u4e0b\u662f\u5173\u4e8ePostgres JOIN\u7684\u5907\u5fd8\u5f55\u603b\u7ed3<\/p>\n<h2>&#8220;JOIN&#8221; \u662f\u4ec0\u4e48\u610f\u601d?<\/h2>\n<p>\u5728\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u8868\u7684\u8fde\u63a5\u65f6<\/p>\n<h3>\u4ec0\u4e48\u65f6\u5019\u4f1a\u53d1\u751f\u8054\u5408\uff1f<\/h3>\n<p>\u5f53\u9700\u8981\u540c\u65f6\u53c2\u8003\u4e24\u4e2a\u6216\u66f4\u591a\u8868\u4e2d\u7684\u8bb0\u5f55\u65f6<\/p>\n<p>\u4f7f\u7528JOIN\u8bed\u53e5\uff0c\u6307\u5b9a\u60f3\u8981\u8fdb\u884c\u8fde\u63a5\u7684\u5217<br \/>\n\u6bd4\u8f83\u8be5\u5217\u7684\u503c\uff0c\u53ef\u4ee5\u5c06\u5177\u6709\u76f8\u540c\u503c\u7684\u6570\u636e\u8fdb\u884c\u8fde\u63a5<\/p>\n<p>\u5728JOIN\u64cd\u4f5c\u4e2d\uff0c\u6709\u4ee5\u4e0b\u9009\u9879\u53ef\u4f9b\u9009\u62e9\uff1a<br \/>\n&#8211; \u4ea4\u53c9\u8fde\u63a5\uff08CROSS JOIN\uff09<br \/>\n&#8211; \u5185\u8fde\u63a5\uff08INNER JOIN\uff09<br \/>\n&#8211; \u5de6\u5916\u8fde\u63a5\uff08LEFT OUTER JOIN\uff09<br \/>\n&#8211; \u53f3\u5916\u8fde\u63a5\uff08RIGHT OUTER JOIN\uff09<br \/>\n&#8211; \u5168\u5916\u8fde\u63a5\uff08FULL OUTER JOIN\uff09<\/p>\n<h2>\u5c55\u793a\u6837\u54c1\u684c<\/h2>\n<p>\u7248\u672c\u4e3aPostgreSQL 9.3.2\u7684\u64cd\u4f5c\u73af\u5883\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"n\">example1<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"n\">id<\/span> <span class=\"nb\">integer<\/span> <span class=\"k\">primary<\/span> <span class=\"k\">key<\/span><span class=\"p\">,<\/span> \r\n  <span class=\"n\">name<\/span> <span class=\"nb\">text<\/span> <span class=\"k\">NOT<\/span> <span class=\"k\">NULL<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"n\">age<\/span> <span class=\"nb\">integer<\/span>\r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"n\">example2<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"n\">id<\/span> <span class=\"nb\">integer<\/span> <span class=\"k\">primary<\/span> <span class=\"k\">key<\/span><span class=\"p\">,<\/span> \r\n  <span class=\"n\">user_id<\/span> <span class=\"nb\">integer<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"n\">hobby<\/span> <span class=\"nb\">text<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"n\">favorite_food<\/span> <span class=\"nb\">text<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"k\">FOREIGN<\/span> <span class=\"k\">KEY<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">references<\/span> <span class=\"n\">example1<\/span><span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">example1<\/span><span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">name<\/span><span class=\"p\">,<\/span> <span class=\"n\">age<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">VALUES<\/span> \r\n    <span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u307b\u3052\u592a\u90ce'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">31<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u3075\u304c\u6b21\u90ce'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">25<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u307d\u3088\u7f8e'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">27<\/span><span class=\"p\">);<\/span>\r\n\r\n\r\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">example2<\/span><span class=\"p\">(<\/span><span class=\"n\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">hobby<\/span><span class=\"p\">,<\/span> <span class=\"n\">favorite_food<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">VALUES<\/span> \r\n    <span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u6563\u6b69'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u308a\u3093\u3054'<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u624b\u82b8'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u79cb\u5200\u9b5a'<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"k\">null<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u30b5\u30c3\u30ab\u30fc'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u30e9\u30fc\u30e1\u30f3'<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"k\">null<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u6620\u753b\u9451\u8cde'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u5bff\u53f8'<\/span><span class=\"p\">);<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/10-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/11-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u4ea4\u53c9\u8fde\u63a5<\/h2>\n<p>\u521b\u5efa\u6240\u6709\u53ef\u80fd\u7684\u7ec4\u5408\u8fde\u63a5\u65b9\u5f0f<br \/>\n\u4e0e\u5176\u4ed6JOIN\u8bed\u53e5\u4e0d\u540c\uff0c\u4e0d\u9700\u8981\u6307\u5b9a\u901a\u8fc7ON\u8fdb\u884c\u8fde\u63a5\u65f6\u6240\u5339\u914d\u7684\u5217\uff0c<br \/>\n\u5c31\u50cf\u968f\u610f\u5730\u8fdb\u884c\u8868\u8fde\u63a5\u4e00\u6837<br \/>\n\u6267\u884c\u7ed3\u679c\u7684\u8bb0\u5f55\u6570\u662f\u8fde\u63a5\u7684\u8868\u7684\u8bb0\u5f55\u6570\u76f8\u4e58\u7684\u7ed3\u679c<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\uff08example1\u7684\u8bb0\u5f55\u6570\uff09\u00d7\uff08example2\u7684\u8bb0\u5f55\u6570\uff09<br \/>\n\u611f\u89c9\u5b9e\u7528\u6027\u4e0d\u592a\u5927<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">example1<\/span> <span class=\"k\">CROSS<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">example2<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/15-0.png\" alt=\"image.png\" \/><\/div>\n<p>* Ven diagrams are simplified.<\/p>\n<h2>(\u5185)\u8fde\u63a5<\/h2>\n<p>\u5728\u6307\u5b9a\u7684\u5173\u8054\u5217\u6216\u8bb0\u5f55\u4e4b\u95f4\uff0c\u4ee5\u8868\u4e3a\u8f74\u8fdb\u884c\u8fde\u63a5\u7684\u65b9\u5f0f\u88ab\u79f0\u4e3a\u5185\u90e8\u8fde\u63a5\u3002<br \/>\n\u5728\u793a\u4f8b\u4e2d\uff0c\u7531\u4e8eexample1\u7684id\u548cexample2\u7684user_id\u662f\u76f8\u5173\u8054\u7684\u5217\uff0c<br \/>\n\u6211\u4eec\u5c06\u6839\u636e\u8fd9\u4e2a\u5173\u7cfb\u8fdb\u884c\u5185\u90e8\u8fde\u63a5\uff0c\u4ee5\u83b7\u53d6example1\u7684\u8bb0\u5f55\u3002<br \/>\n\u5728\u6307\u5b9a\u76f8\u5e94\u7684\u5217\u65f6\uff0c\u4f7f\u7528ON\u6765\u8fdb\u884c\u6307\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">example1<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">example2<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">example2<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">example1<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>* \u53ef\u4ee5\u7701\u7565INNER\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/21-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/22-0.png\" alt=\"image.png\" \/><\/div>\n<h2>LEFT OUTER JOIN \u5de6\u5916\u8fde\u63a5<\/h2>\n<p>\u5373\u4f7f\u5728JOIN\u8bed\u53e5\u4e2d\u6307\u5b9a\u7684\u8868\u4e2d\u6ca1\u6709\u76f8\u5e94\u7684\u8bb0\u5f55\uff0c\u4e5f\u4f1a\u83b7\u53d6FROM\u8bed\u53e5\u4e2d\u6307\u5b9a\u7684\u8868\u7684\u6240\u6709\u8bb0\u5f55\u7684\u65b9\u5f0f\u3002\u5728\u793a\u4f8b\u4e2d\uff0c\u867d\u7136\u5728example1\u4e2did\u4e3a3\u7684\u8bb0\u5f55\u5728example2\u4e2d\u4e0d\u5b58\u5728\uff0c\u4f46\u5b83\u88ab\u63d0\u53d6\u5e76\u5728\u5217\u4e2d\u8bbe\u7f6e\u4e3anull\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">example1<\/span> <span class=\"k\">LEFT<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">example2<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">example2<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">example1<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>* OUTER\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/27-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/28-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u53f3\uff08\u5916\uff09\u8fde\u63a5<\/h2>\n<p>\u4e0eLEFT JOIN\u76f8\u53cd\uff0c\u5373\u4f7f\u5728FROM\u5b50\u53e5\u4e2d\u6ca1\u6709\u76f8\u5e94\u7684\u8bb0\u5f55\uff0c\u4e5f\u4f1a\u83b7\u53d6JOIN\u5b50\u53e5\u4e2d\u6307\u5b9a\u7684\u8868\u7684\u6240\u6709\u8bb0\u5f55\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u6211\u89c9\u5f97\u4e0d\u4f1a\u7ecf\u5e38\u4f7f\u7528\uff0c\u60f3\u5230\u4e86\u53ef\u4ee5\u628a\u4f5c\u4e3a\u4e3b\u8981\u4f9d\u636e\u7684\u8868\u4e0eLEFT JOIN\u7684\u65b9\u5f0f\u5bf9\u8c03\u4e00\u4e0b\u3002<br \/>\n\uff08\u56e0\u4e3a\u6211\u53ea\u662f\u65e0\u77e5\uff0c\u6240\u4ee5\u5982\u679c\u6709\u610f\u4e49\u7684\u8bdd\uff0c\u8bf7\u6559\u4e00\u4e0b\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">example1<\/span> <span class=\"k\">RIGHT<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">example2<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">example2<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">example1<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>*OUTER\u53ef\u4ee5\u7701\u7565\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/34-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/35-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u5b8c\u5168\u5916\u8fde\u63a5<\/h2>\n<p>\u83b7\u53d6\u5408\u5e76\u8bb0\u5f55\u4ee5\u53ca\u6240\u6709\u4e0d\u5bf9\u5e94\u7684\u8bb0\u5f55\u7684\u65b9\u6cd5\u3002<br \/>\n\u8fd9\u4e0eLEFT JOIN\u3001RIGHT JOIN\u7684\u5185\u8fde\u63a5+\u03b1\u88ab\u79f0\u4e3a\u5916\u8fde\u63a5\u3002<br \/>\n\u6211\u611f\u89c9\u8fd9\u79cd\u65b9\u5f0f\u4e5f\u4e0d\u592a\u5e38\u7528\u3002<br \/>\n\u5728Postgres\u4e2d\u53ef\u4ee5\u4f7f\u7528\uff0c\u4f46\u5728\u5176\u4ed6\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u53ef\u80fd\u65e0\u6cd5\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">example1<\/span> <span class=\"k\">FULL<\/span> <span class=\"k\">OUTER<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">example2<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">example2<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">example1<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/39-0.png\" alt=\"image.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d469e37434c4406ca5b94\/40-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u9664\u4e86INNER JOIN\u548cLEFT JOIN\u4e4b\u5916\uff0c\u6211\u611f\u89c9\u5176\u4ed6\u7684\u7528\u6cd5\u5e76\u4e0d\u5e38\u89c1\u3002<br 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