{"id":75846,"date":"2024-10-16T01:43:18","date_gmt":"2024-10-15T17:43:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75846\/"},"modified":"2024-10-16T01:43:18","modified_gmt":"2024-10-15T17:43:18","slug":"mysql-%e5%89%b5%e5%bb%baindex%e6%8f%90%e9%ab%98%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75846\/","title":{"rendered":"MySQL \u5275\u5efaINDEX\u63d0\u9ad8\u591a\u8868\u67e5\u8a62\u6548\u7387"},"content":{"rendered":"<h1 id=\"mysql-%e5%89%b5%e5%bb%ba-index-%e6%8f%90%e9%ab%98%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87-ngldsZVbHb\">MySQL \u5275\u5efa INDEX \u63d0\u9ad8\u591a\u8868\u67e5\u8a62\u6548\u7387<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u8a62\u6548\u7387\u662f\u5f71\u97ff\u7cfb\u7d71\u6027\u80fd\u7684\u95dc\u9375\u56e0\u7d20\u4e4b\u4e00\u3002MySQL \u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u5176\u4e2d\u5275\u5efa\u7d22\u5f15\uff08INDEX\uff09\u662f\u6700\u6709\u6548\u7684\u624b\u6bb5\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u901a\u904e\u5275\u5efa\u7d22\u5f15\u4f86\u63d0\u9ad8\u591a\u8868\u67e5\u8a62\u7684\u6548\u7387\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-ngldsZVbHb\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002\u7576\u6211\u5011\u5728\u6578\u64da\u8868\u4e0a\u57f7\u884c\u67e5\u8a62\u6642\uff0cMySQL \u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f86\u6e1b\u5c11\u9700\u8981\u6383\u63cf\u7684\u884c\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%9c%a8%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e4%b8%ad%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%ef%bc%9f-ngldsZVbHb\">\u70ba\u4ec0\u9ebc\u9700\u8981\u5728\u591a\u8868\u67e5\u8a62\u4e2d\u4f7f\u7528\u7d22\u5f15\uff1f<\/h2>\n<p>\u5728\u591a\u8868\u67e5\u8a62\u4e2d\uff0c\u5c24\u5176\u662f\u4f7f\u7528 JOIN \u64cd\u4f5c\u6642\uff0c\u6578\u64da\u5eab\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u5982\u679c\u9019\u4e9b\u8868\u6c92\u6709\u9069\u7576\u7684\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u5c07\u4e0d\u5f97\u4e0d\u9032\u884c\u5168\u8868\u6383\u63cf\uff0c\u9019\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u901a\u904e\u5728\u95dc\u806f\u5b57\u6bb5\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95%ef%bc%9f-ngldsZVbHb\">\u5982\u4f55\u5275\u5efa\u7d22\u5f15\uff1f<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column1, column2, ...);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>users<\/code> \u548c <code>orders<\/code>\uff0c\u4e26\u4e14\u6211\u5011\u5e0c\u671b\u6839\u64da\u7528\u6236 ID \u4f86\u67e5\u8a62\u8a02\u55ae\u3002\u6211\u5011\u53ef\u4ee5\u5728 <code>orders<\/code> \u8868\u7684 <code>user_id<\/code> \u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_user_id ON orders (user_id);<\/code><\/pre>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%a4%ba%e4%be%8b-ngldsZVbHb\">\u591a\u8868\u67e5\u8a62\u7684\u793a\u4f8b<\/h2>\n<p>\u8003\u616e\u4ee5\u4e0b\u67e5\u8a62\uff0c\u5b83\u5f9e <code>users<\/code> \u8868\u548c <code>orders<\/code> \u8868\u4e2d\u6aa2\u7d22\u7528\u6236\u53ca\u5176\u8a02\u55ae\uff1a<\/p>\n<pre><code>SELECT u.name, o.order_date \nFROM users u \nJOIN orders o ON u.id = o.user_id \nWHERE u.status = 'active';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>users<\/code> \u8868\u7684 <code>id<\/code> \u5217\u548c <code>orders<\/code> \u8868\u7684 <code>user_id<\/code> \u5217\u4e4b\u9593\u7684\u95dc\u806f\u662f\u95dc\u9375\u3002\u5982\u679c\u6211\u5011\u5728 <code>orders<\/code> \u8868\u7684 <code>user_id<\/code> \u5217\u4e0a\u5275\u5efa\u4e86\u7d22\u5f15\uff0cMySQL \u5c07\u80fd\u5920\u66f4\u5feb\u5730\u627e\u5230\u76f8\u95dc\u7684\u8a02\u55ae\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b-ngldsZVbHb\">\u7d22\u5f15\u7684\u985e\u578b<\/h2>\n<p>MySQL \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\u5927\u591a\u6578\u67e5\u8a62\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u9069\u7528\u65bc\u7b49\u503c\u67e5\u8a62\uff0c\u4f46\u4e0d\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u5168\u6587\u7d22\u5f15\uff1a<\/strong>\u9069\u7528\u65bc\u6587\u672c\u641c\u7d22\uff0c\u80fd\u5920\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u7a7a\u9593\u7d22\u5f15\uff1a<\/strong>\u9069\u7528\u65bc\u5730\u7406\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-ngldsZVbHb\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u80fd\u5920\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u7684\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u64cd\u4f5c\u7684\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5728\u5275\u5efa\u7d22\u5f15\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u5408\u7406\u898f\u5283\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ngldsZVbHb\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u5728 MySQL \u4e2d\u5275\u5efa\u9069\u7576\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u591a\u8868\u67e5\u8a62\u7684\u6548\u7387\u3002\u4e86\u89e3\u4e0d\u540c\u985e\u578b\u7684\u7d22\u5f15\u53ca\u5176\u9069\u7528\u5834\u666f\uff0c\u4e26\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u7d22\u5f15\u8a2d\u8a08\uff0c\u5c07\u6709\u52a9\u65bc\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 MySQL \u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u5275\u5efaINDEX\uff0c\u4ee5\u63d0\u9ad8\u591a\u8868\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u6aa2\u7d22\u6027\u80fd\uff0c\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-75846","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=75846"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75846\/revisions"}],"predecessor-version":[{"id":75847,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75846\/revisions\/75847"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}