{"id":76644,"date":"2024-10-16T08:37:15","date_gmt":"2024-10-16T00:37:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76644\/"},"modified":"2024-10-16T08:37:16","modified_gmt":"2024-10-16T00:37:16","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96sql%e7%9a%84%e4%b8%89%e5%80%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76644\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u512a\u5316SQL\u7684\u4e09\u500b\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96sql%e7%9a%84%e4%b8%89%e5%80%8b%e6%96%b9%e6%b3%95-QCPLSaOQyr\">MySQL\u6578\u64da\u5eab\u512a\u5316SQL\u7684\u4e09\u500b\u65b9\u6cd5<\/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\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u7db2\u7ad9\u548c\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u70ba\u4e86\u78ba\u4fddMySQL\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\uff0c\u512a\u5316SQL\u67e5\u8a62\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e09\u7a2e\u6709\u6548\u7684MySQL\u6578\u64da\u5eab\u512a\u5316SQL\u7684\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e4%be%86%e5%8a%a0%e9%80%9f%e6%9f%a5%e8%a9%a2-QCPLSaOQyr\">1. \u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62<\/h2>\n<p>\u7d22\u5f15\u662f\u6578\u64da\u5eab\u4e2d\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0cMySQL\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\uff0c\u800c\u7121\u9700\u6383\u63cf\u6574\u500b\u8868\u3002<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684\u5217\uff1a<\/strong>\u901a\u5e38\uff0c\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u689d\u4ef6\uff08\u5982WHERE\u5b50\u53e5\uff09\u6216\u6392\u5e8f\uff08\u5982ORDER BY\u5b50\u53e5\uff09\u7684\u5217\u61c9\u8a72\u8003\u616e\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li><strong>\u907f\u514d\u904e\u591a\u7d22\u5f15\uff1a<\/strong>\u96d6\u7136\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u7684\u63d2\u5165\u548c\u66f4\u65b0\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u8b39\u614e\u9078\u64c7\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u5305\u542b\u7528\u6236ID\u3001\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u5982\u679c\u7d93\u5e38\u6839\u64da\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u67e5\u8a62\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_email ON users(email);<\/code><\/pre>\n<h2 id=\"2-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-QCPLSaOQyr\">2. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u64b0\u5beb\u9ad8\u6548\u7684SQL\u67e5\u8a62\u8a9e\u53e5\u662f\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u7684\u53e6\u4e00\u500b\u95dc\u9375\u56e0\u7d20\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u7684\u6280\u5de7\uff1a<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5fc5\u8981\u7684\u5217\uff1a<\/strong>\u5728SELECT\u8a9e\u53e5\u4e2d\uff0c\u50c5\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u800c\u4e0d\u662f\u4f7f\u7528SELECT *\u3002\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\uff0c\u56e0\u70baJOIN\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528\u51fd\u6578\u5728WHERE\u5b50\u53e5\u4e2d\uff1a<\/strong>\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\uff0c\u61c9\u76e1\u91cf\u907f\u514d\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u4ee5\u9032\u884c\u512a\u5316\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE YEAR(created_at) = 2023;<\/code><\/pre>\n<p>\u53ef\u4ee5\u6539\u5beb\u70ba\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE created_at BETWEEN '2023-01-01' AND '2023-12-31';<\/code><\/pre>\n<h2 id=\"3-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-QCPLSaOQyr\">3. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u662f\u78ba\u4fdd\u5176\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u9019\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5206\u6790\u548c\u512a\u5316\u8868\uff1a<\/strong>\u4f7f\u7528ANALYZE TABLE\u548cOPTIMIZE TABLE\u547d\u4ee4\u4f86\u66f4\u65b0\u8868\u7684\u7d71\u8a08\u4fe1\u606f\u548c\u91cd\u5efa\u8868\u7684\u7269\u7406\u7d50\u69cb\u3002<\/li>\n<li><strong>\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff1a<\/strong>\u5b9a\u671f\u522a\u9664\u904e\u671f\u6216\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\uff0c\u4ee5\u6e1b\u5c11\u8868\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u512a\u5316\u8868\uff1a<\/p>\n<pre><code>OPTIMIZE TABLE users;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QCPLSaOQyr\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4f7f\u7528\u7d22\u5f15\u3001\u512a\u5316\u67e5\u8a62\u8a9e\u53e5\u548c\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u80fd\u5920\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u80fd\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u9019\u4e9b\u512a\u5316\u63aa\u65bd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u4ee5\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u5eab\u904b\u884c\u6d41\u66a2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u6578\u64da\u5eab\u512a\u5316\u7684\u4e09\u500b\u6709\u6548\u65b9\u6cd5\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u97ff\u61c9\u6642\u9593\uff0c\u78ba\u4fdd\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-76644","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76644","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=76644"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76644\/revisions"}],"predecessor-version":[{"id":76645,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76644\/revisions\/76645"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}