{"id":74923,"date":"2024-10-15T23:01:17","date_gmt":"2024-10-15T15:01:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/74923\/"},"modified":"2024-10-15T23:01:18","modified_gmt":"2024-10-15T15:01:18","slug":"mysql-sql%e5%84%aa%e5%8c%96%e7%9a%84%e7%b4%a2%e5%bc%95%e5%95%8f%e9%a1%8c%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/74923\/","title":{"rendered":"MySQL SQL\u512a\u5316\u7684\u7d22\u5f15\u554f\u984c\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"mysql-sql%e5%84%aa%e5%8c%96%e7%9a%84%e7%b4%a2%e5%bc%95%e5%95%8f%e9%a1%8c%e8%a9%b3%e8%a7%a3-QhDhmjTGBM\">MySQL SQL\u512a\u5316\u7684\u7d22\u5f15\u554f\u984c\u8a73\u89e3<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684\u7d22\u5f15\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u512a\u5316\u5efa\u8b70\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-QhDhmjTGBM\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\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\u884c\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>\u5c08\u9580\u7528\u65bc\u6587\u672c\u641c\u7d22\u3002<\/li>\n<li><strong>\u7a7a\u9593\u7d22\u5f15\uff1a<\/strong>\u7528\u65bc\u5730\u7406\u6578\u64da\u7684\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%84%aa%e5%8b%a2-QhDhmjTGBM\">\u7d22\u5f15\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u7d22\u5f15\u7684\u4e3b\u8981\u512a\u52e2\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff1a\u7d22\u5f15\u80fd\u5920\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002<\/li>\n<li>\u6e1b\u5c11I\/O\u64cd\u4f5c\uff1a\u901a\u904e\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u627e\u5230\u6240\u9700\u7684\u6578\u64da\uff0c\u5f9e\u800c\u6e1b\u5c11\u78c1\u789f\u8b80\u53d6\u7684\u6b21\u6578\u3002<\/li>\n<li>\u652f\u6301\u6392\u5e8f\u548c\u5206\u7d44\uff1a\u7d22\u5f15\u53ef\u4ee5\u52a0\u901fORDER BY\u548cGROUP BY\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e7%bc%ba%e9%bb%9e-QhDhmjTGBM\">\u7d22\u5f15\u7684\u7f3a\u9ede<\/h2>\n<p>\u5118\u7ba1\u7d22\u5f15\u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li>\u589e\u52a0\u5b58\u5132\u7a7a\u9593\uff1a\u6bcf\u500b\u7d22\u5f15\u90fd\u9700\u8981\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<li>\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff1a\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6578\u64da\u6642\uff0c\u7d22\u5f15\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u9019\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<li>\u7dad\u8b77\u6210\u672c\uff1a\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\uff0c\u7d22\u5f15\u7684\u7dad\u8b77\u6210\u672c\u4e5f\u6703\u589e\u52a0\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%84%aa%e5%8c%96%e7%b4%a2%e5%bc%95-QhDhmjTGBM\">\u5982\u4f55\u512a\u5316\u7d22\u5f15<\/h2>\n<p>\u70ba\u4e86\u5145\u5206\u767c\u63ee\u7d22\u5f15\u7684\u6548\u80fd\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84%e7%b4%a2%e5%bc%95%e9%a1%9e%e5%9e%8b-QhDhmjTGBM\">1. \u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b<\/h3>\n<p>\u6839\u64da\u67e5\u8a62\u7684\u7279\u6027\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u9700\u8981\u9032\u884c\u7bc4\u570d\u67e5\u8a62\u7684\u5b57\u6bb5\uff0c\u61c9\u9078\u64c7B-Tree\u7d22\u5f15\uff1b\u800c\u5c0d\u65bc\u7cbe\u78ba\u67e5\u8a62\uff0c\u54c8\u5e0c\u7d22\u5f15\u53ef\u80fd\u66f4\u5408\u9069\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%a4%87%e5%90%88%e7%b4%a2%e5%bc%95-QhDhmjTGBM\">2. \u4f7f\u7528\u8907\u5408\u7d22\u5f15<\/h3>\n<p>\u5c0d\u65bc\u7d93\u5e38\u4e00\u8d77\u67e5\u8a62\u7684\u591a\u500b\u5217\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u7684\u6642\u9593\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE INDEX idx_name ON table_name (column1, column2);<\/code><\/pre>\n<h3 id=\"3-%e5%ae%9a%e6%9c%9f%e6%aa%a2%e6%9f%a5%e5%92%8c%e9%87%8d%e5%bb%ba%e7%b4%a2%e5%bc%95-QhDhmjTGBM\">3. \u5b9a\u671f\u6aa2\u67e5\u548c\u91cd\u5efa\u7d22\u5f15<\/h3>\n<p>\u96a8\u8457\u6578\u64da\u7684\u8b8a\u5316\uff0c\u7d22\u5f15\u53ef\u80fd\u6703\u8b8a\u5f97\u4e0d\u518d\u9ad8\u6548\u3002\u5b9a\u671f\u6aa2\u67e5\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u4e26\u6839\u64da\u9700\u8981\u91cd\u5efa\u6216\u522a\u9664\u4e0d\u518d\u4f7f\u7528\u7684\u7d22\u5f15\u3002<\/p>\n<h3 id=\"4-%e9%81%bf%e5%85%8d%e9%81%8e%e5%ba%a6%e7%b4%a2%e5%bc%95-QhDhmjTGBM\">4. 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id=\"%e7%b5%90%e8%ab%96-QhDhmjTGBM\">\u7d50\u8ad6<\/h2>\n<p>\u7d22\u5f15\u5728MySQL\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7136\u800c\uff0c\u958b\u767c\u8005\u5728\u4f7f\u7528\u7d22\u5f15\u6642\u4e5f\u9700\u8003\u616e\u5176\u7f3a\u9ede\uff0c\u4e26\u63a1\u53d6\u76f8\u61c9\u7684\u512a\u5316\u63aa\u65bd\u3002\u901a\u904e\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u3001\u4f7f\u7528\u8907\u5408\u7d22\u5f15\u3001\u5b9a\u671f\u6aa2\u67e5\u548c\u91cd\u5efa\u7d22\u5f15\uff0c\u4ee5\u53ca\u907f\u514d\u904e\u5ea6\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eMySQL SQL\u512a\u5316\u4e2d\u7684\u7d22\u5f15\u554f\u984c\uff0c\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\u8207\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u80fd\u8207\u6578\u64da\u8655\u7406\u6548\u7387\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-74923","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74923","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=74923"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74923\/revisions"}],"predecessor-version":[{"id":74924,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74923\/revisions\/74924"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=74923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=74923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=74923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}