{"id":183678,"date":"2024-11-10T06:49:17","date_gmt":"2024-11-09T22:49:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183678\/"},"modified":"2024-11-10T06:49:18","modified_gmt":"2024-11-09T22:49:18","slug":"%e4%bd%bf%e7%94%a8db%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e5%85%a9%e5%bc%b5%e8%a1%a8%e7%9a%84%e6%95%b8%e6%93%9a-db%e6%95%b8%e6%93%9a%e5%ba%ab%e5%85%a9%e5%bc%b5%e8%a1%a8-%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183678\/","title":{"rendered":"\u4f7f\u7528DB\u6578\u64da\u5eab\u67e5\u8a62\u5169\u5f35\u8868\u7684\u6578\u64da (db\u6578\u64da\u5eab\u5169\u5f35\u8868 \u67e5\u8a62)"},"content":{"rendered":"<h1 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id=\"%e8%81%af%e6%8e%a5%e6%93%8d%e4%bd%9c%e7%9a%84%e9%a1%9e%e5%9e%8b-dBZUvEuoGI\">\u806f\u63a5\u64cd\u4f5c\u7684\u985e\u578b<\/h2>\n<p>\u5728DB\u6578\u64da\u5eab\u4e2d\uff0c\u4e3b\u8981\u6709\u5e7e\u7a2e\u806f\u63a5\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u806f\u63a5\uff08INNER JOIN\uff09<\/strong>\uff1a\u53ea\u8fd4\u56de\u5169\u5f35\u8868\u4e2d\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u5de6\u806f\u63a5\uff08LEFT JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5de6\u8868\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u53f3\u806f\u63a5\uff08RIGHT JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u53f3\u8868\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>\u5168\u5916\u806f\u63a5\uff08FULL OUTER JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5169\u5f35\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-dBZUvEuoGI\">\u67e5\u8a62\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u5f35\u8868\uff1a<code>users<\/code>\u548c<code>orders<\/code>\u3002<code>users<\/code>\u8868\u5305\u542b\u7528\u6236\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u800c<code>orders<\/code>\u8868\u5247\u8a18\u9304\u4e86\u7528\u6236\u7684\u8a02\u55ae\u4fe1\u606f\u3002\u9019\u5169\u5f35\u8868\u901a\u904e\u7528\u6236ID\uff08<code>user_id<\/code>\uff09\u9032\u884c\u95dc\u806f\u3002<\/p>\n<h3 id=\"1-%e5%85%a7%e8%81%af%e6%8e%a5%e7%a4%ba%e4%be%8b-dBZUvEuoGI\">1. \u5167\u806f\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT users.name, orders.order_id\nFROM users\nINNER JOIN orders ON users.user_id = orders.user_id;\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u6709\u8a02\u55ae\u7684\u7528\u6236\u59d3\u540d\u53ca\u5176\u8a02\u55aeID\u3002<\/p>\n<h3 id=\"2-%e5%b7%a6%e8%81%af%e6%8e%a5%e7%a4%ba%e4%be%8b-dBZUvEuoGI\">2. \u5de6\u806f\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT users.name, orders.order_id\nFROM users\nLEFT JOIN orders ON users.user_id = orders.user_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u7684\u59d3\u540d\uff0c\u5373\u4f7f\u4ed6\u5011\u6c92\u6709\u8a02\u55ae\uff0c\u5c0d\u65bc\u6c92\u6709\u8a02\u55ae\u7684\u7528\u6236\uff0c<code>order_id<\/code>\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n<h3 id=\"3-%e5%8f%b3%e8%81%af%e6%8e%a5%e7%a4%ba%e4%be%8b-dBZUvEuoGI\">3. \u53f3\u806f\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT users.name, orders.order_id\nFROM users\nRIGHT JOIN orders ON users.user_id = orders.user_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u8a02\u55ae\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u5373\u4f7f\u67d0\u4e9b\u8a02\u55ae\u7684\u7528\u6236\u4fe1\u606f\u7f3a\u5931\u3002<\/p>\n<h3 id=\"4-%e5%85%a8%e5%a4%96%e8%81%af%e6%8e%a5%e7%a4%ba%e4%be%8b-dBZUvEuoGI\">4. \u5168\u5916\u806f\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT users.name, orders.order_id\nFROM users\nFULL OUTER JOIN orders ON users.user_id = orders.user_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u548c\u6240\u6709\u8a02\u55ae\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u7121\u8ad6\u5b83\u5011\u662f\u5426\u5339\u914d\u3002<\/p>\n<h2 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