{"id":76782,"date":"2024-10-16T09:53:16","date_gmt":"2024-10-16T01:53:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76782\/"},"modified":"2024-10-16T09:53:17","modified_gmt":"2024-10-16T01:53:17","slug":"mysql%e7%b4%a2%e5%bc%95%e5%92%8c%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76782\/","title":{"rendered":"MySQL\u7d22\u5f15\u548c\u67e5\u8a62\u512a\u5316\u7684\u5be6\u969b\u64cd\u4f5c"},"content":{"rendered":"<h1 id=\"mysql%e7%b4%a2%e5%bc%95%e5%92%8c%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c-rgVppeEAjX\">MySQL\u7d22\u5f15\u548c\u67e5\u8a62\u512a\u5316\u7684\u5be6\u969b\u64cd\u4f5c<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u5176\u4e2d\u7d22\u5f15\u662f\u6700\u91cd\u8981\u7684\u90e8\u5206\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u63a2\u8a0eMySQL\u7d22\u5f15\u7684\u57fa\u672c\u6982\u5ff5\u53ca\u5176\u5728\u67e5\u8a62\u512a\u5316\u4e2d\u7684\u5be6\u969b\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afmysql%e7%b4%a2%e5%bc%95%ef%bc%9f-rgVppeEAjX\">\u4ec0\u9ebc\u662fMySQL\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u6578\u64da\u3002MySQL\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>B-Tree\u7d22\u5f15\uff1a<\/strong>\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\uff0c\u9069\u7528\u65bc\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u9069\u5408\u7cbe\u78ba\u67e5\u8a62\uff0c\u4f46\u4e0d\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff1a<\/strong>\u7528\u65bc\u5feb\u901f\u67e5\u627e\u6587\u672c\u6578\u64da\u3002<\/li>\n<li><strong>\u7a7a\u9593\u7d22\u5f15\uff1a<\/strong>\u5c08\u70ba\u5730\u7406\u6578\u64da\u8a2d\u8a08\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95-rgVppeEAjX\">\u5982\u4f55\u5275\u5efa\u7d22\u5f15<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u5728\u201cemail\u201d\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX idx_email ON users (email);<\/code><\/pre>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-rgVppeEAjX\">\u7d22\u5f15\u7684\u512a\u7f3a\u9ede<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e5f\u6709\u5176\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u589e\u52a0\u4e86\u6578\u64da\u5beb\u5165\u7684\u6210\u672c\uff0c\u56e0\u70ba\u6bcf\u6b21\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u90fd\u9700\u8981\u66f4\u65b0\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c-rgVppeEAjX\">\u67e5\u8a62\u512a\u5316\u7684\u5be6\u969b\u64cd\u4f5c<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528\u7d22\u5f15\u5916\uff0c\u9084\u6709\u5176\u4ed6\u5e7e\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u512a\u5316MySQL\u67e5\u8a62\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8explain%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-rgVppeEAjX\">1. \u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528EXPLAIN\u547d\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u627e\u51fa\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>EXPLAIN SELECT * FROM users WHERE email = 'example@example.com';<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793aMySQL\u5982\u4f55\u57f7\u884c\u8a72\u67e5\u8a62\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u548c\u884c\u6578\u3002<\/p>\n<h3 id=\"2-%e9%81%bf%e5%85%8dselect-rgVppeEAjX\">2. \u907f\u514dSELECT *<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528SELECT *\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\uff0c\u61c9\u8a72\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT id, email FROM users WHERE email = 'example@example.com';<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8join%e8%80%8c%e9%9d%9e%e5%ad%90%e6%9f%a5%e8%a9%a2-rgVppeEAjX\">3. \u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u6bd4\u5b50\u67e5\u8a62\u66f4\u6709\u6548\u7387\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT u.id, o.order_date \nFROM users u \nJOIN orders o ON u.id = o.user_id \nWHERE u.email = 'example@example.com';<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-rgVppeEAjX\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7d22\u5f15\u548c\u67e5\u8a62\u512a\u5316\u662f\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u56e0\u7d20\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u3001\u5206\u6790\u67e5\u8a62\u8a08\u5283\u4ee5\u53ca\u9078\u64c7\u5408\u9069\u7684\u67e5\u8a62\u65b9\u5f0f\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u6578\u64da\u5eab\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> 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