{"id":195051,"date":"2024-11-13T11:47:20","date_gmt":"2024-11-13T03:47:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/195051\/"},"modified":"2024-11-13T11:47:21","modified_gmt":"2024-11-13T03:47:21","slug":"%e5%84%aa%e5%8c%96mysql%e6%80%a7%e8%83%bd%e7%9a%84%e7%b5%95%e6%8b%9b%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/195051\/","title":{"rendered":"\u512a\u5316MySQL\u6027\u80fd\u7684\u201c\u7d55\u62db\u201d\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"<h1 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id=\"2-%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-aYIUkOWCff\">2. \u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u512a\u5316SQL\u67e5\u8a62\u662f\u63d0\u5347\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u67e5\u8a62\u512a\u5316\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62\uff1a<\/strong>\u901a\u904e\u4f7f\u7528EXPLAIN\u8a9e\u53e5\uff0c\u53ef\u4ee5\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u7684\u5927\u5c0f\u3002<\/li>\n<li><strong>\u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u6bd4\u5b50\u67e5\u8a62\u66f4\u9ad8\u6548\u3002<\/li>\n<\/ul>\n<h2 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id=\"5-%e4%bd%bf%e7%94%a8%e5%88%86%e5%8d%80%e6%8a%80%e8%a1%93-aYIUkOWCff\">5. \u4f7f\u7528\u5206\u5340\u6280\u8853<\/h2>\n<p>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\uff0c\u4f7f\u7528\u5206\u5340\u6280\u8853\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u5c07\u8868\u5206\u6210\u591a\u500b\u5c0f\u90e8\u5206\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n<h2 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