{"id":162927,"date":"2024-11-04T19:11:19","date_gmt":"2024-11-04T11:11:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162927\/"},"modified":"2024-11-04T19:11:20","modified_gmt":"2024-11-04T11:11:20","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e8%a8%ad%e8%a8%88%e9%ab%98%e6%95%88%e5%90%88%e7%90%86%e7%9a%84mysql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162927\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u8a2d\u8a08\u9ad8\u6548\u5408\u7406\u7684MySQL\u67e5\u8a62\u8a9e\u53e5"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e8%a8%ad%e8%a8%88%e9%ab%98%e6%95%88%e5%90%88%e7%90%86%e7%9a%84mysql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-hOuHPJXqmk\">\u6559\u60a8\u5982\u4f55\u8a2d\u8a08\u9ad8\u6548\u5408\u7406\u7684MySQL\u67e5\u8a62\u8a9e\u53e5<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u8a2d\u8a08\u9ad8\u6548\u7684\u67e5\u8a62\u8a9e\u53e5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\uff0c\u9084\u80fd\u6e1b\u5c11\u4f3a\u670d\u5668\u7684\u8ca0\u64d4\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u8a2d\u8a08\u9ad8\u6548\u5408\u7406\u7684MySQL\u67e5\u8a62\u8a9e\u53e5\u7684\u6280\u5de7\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"1-%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b-hOuHPJXqmk\">1. \u7406\u89e3\u6578\u64da\u7d50\u69cb<\/h2>\n<p>\u5728\u64b0\u5beb\u67e5\u8a62\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5c0d\u6578\u64da\u5eab\u7684\u7d50\u69cb\u6709\u6e05\u6670\u7684\u4e86\u89e3\u3002\u9019\u5305\u62ec\u8868\u7684\u8a2d\u8a08\u3001\u5b57\u6bb5\u985e\u578b\u3001\u7d22\u5f15\u7684\u4f7f\u7528\u7b49\u3002\u826f\u597d\u7684\u6578\u64da\u7d50\u69cb\u8a2d\u8a08\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-hOuHPJXqmk\">2. \u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u5e38\u7528\u7684\u67e5\u8a62\u5b57\u6bb5\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u5408\u7406\u914d\u7f6e\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>CREATE INDEX idx_username ON users (username);<\/code><\/pre>\n<h2 id=\"3-%e9%81%bf%e5%85%8d%e4%bd%bf%e7%94%a8select-hOuHPJXqmk\">3. \u907f\u514d\u4f7f\u7528SELECT *<\/h2>\n<p>\u4f7f\u7528SELECT *\u6703\u6aa2\u7d22\u8868\u4e2d\u7684\u6240\u6709\u5217\uff0c\u9019\u5728\u6578\u64da\u91cf\u5927\u6642\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>SELECT username, email FROM users WHERE id = 1;<\/code><\/pre>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-hOuHPJXqmk\">4. \u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u6578\u64da<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528WHERE\u5b50\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u78ba\u4fdd\u5728WHERE\u689d\u4ef6\u4e2d\u4f7f\u7528\u7d22\u5f15\u5b57\u6bb5\uff0c\u4ee5\u9032\u4e00\u6b65\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>SELECT * FROM users WHERE created_at &gt; '2023-01-01';<\/code><\/pre>\n<h2 id=\"5-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8join-hOuHPJXqmk\">5. \u9069\u7576\u4f7f\u7528JOIN<\/h2>\n<p>\u5728\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u6642\uff0cJOIN\u64cd\u4f5c\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u7136\u800c\uff0c\u904e\u591a\u7684JOIN\u6703\u5c0e\u81f4\u67e5\u8a62\u8b8a\u5f97\u8907\u96dc\u4e14\u7de9\u6162\u3002\u61c9\u8a72\u6839\u64da\u5be6\u969b\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684JOIN\u985e\u578b\uff08INNER JOIN\u3001LEFT JOIN\u7b49\uff09\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>SELECT u.username, o.order_date \nFROM users u \nINNER JOIN orders o ON u.id = o.user_id;<\/code><\/pre>\n<h2 id=\"6-%e4%bd%bf%e7%94%a8limit%e9%99%90%e5%88%b6%e7%b5%90%e6%9e%9c%e9%9b%86-hOuHPJXqmk\">6. \u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528LIMIT\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u7d50\u679c\u96c6\u5927\u5c0f\uff0c\u9019\u5c0d\u65bc\u9700\u8981\u5206\u9801\u986f\u793a\u7684\u61c9\u7528\u7279\u5225\u6709\u7528\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\uff0c\u63d0\u9ad8\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>SELECT * FROM users LIMIT 10;<\/code><\/pre>\n<h2 id=\"7-%e5%ae%9a%e6%9c%9f%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab-hOuHPJXqmk\">7. \u5b9a\u671f\u512a\u5316\u6578\u64da\u5eab<\/h2>\n<p>\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u53ef\u80fd\u6703\u4e0b\u964d\u3002\u5b9a\u671f\u57f7\u884c\u512a\u5316\u64cd\u4f5c\uff0c\u5982ANALYZE TABLE\u548cOPTIMIZE TABLE\uff0c\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a-hOuHPJXqmk\">\u793a\u4f8b\uff1a<\/h3>\n<pre><code>OPTIMIZE TABLE users;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hOuHPJXqmk\">\u7e3d\u7d50<\/h2>\n<p>\u8a2d\u8a08\u9ad8\u6548\u5408\u7406\u7684MySQL\u67e5\u8a62\u8a9e\u53e5\u9700\u8981\u5c0d\u6578\u64da\u7d50\u69cb\u6709\u6df1\u5165\u7684\u7406\u89e3\uff0c\u5408\u7406\u4f7f\u7528\u7d22\u5f15\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u6aa2\u7d22\uff0c\u4e26\u5b9a\u671f\u512a\u5316\u6578\u64da\u5eab\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u9084\u80fd\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u65b9\u6848\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>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u9ad8\u6548\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u8a2d\u8a08\u9ad8\u6548\u5408\u7406\u7684MySQL\u67e5\u8a62\u8a9e\u53e5\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u512a\u5316\u6027\u80fd\uff0c\u8b93\u60a8\u7684\u6578\u64da\u5eab\u904b\u884c\u66f4\u6d41\u66a2\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-162927","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162927","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=162927"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162927\/revisions"}],"predecessor-version":[{"id":162928,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162927\/revisions\/162928"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}