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id=\"2-%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-rzZbWMOito\">2. \u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u67e5\u8a62\u7684\u6548\u7387\u76f4\u63a5\u5f71\u97ff\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u512a\u5316\u67e5\u8a62\u8a9e\u53e5\u662f\u63d0\u5347\u6027\u80fd\u7684\u91cd\u8981\u6b65\u9a5f\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62\uff1a<\/strong>\u901a\u904eEXPLAIN\u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u8b58\u5225\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u50c5\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\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\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"3-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88%e5%84%aa%e5%8c%96-rzZbWMOito\">3. 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