{"id":162975,"date":"2024-11-04T19:36:19","date_gmt":"2024-11-04T11:36:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162975\/"},"modified":"2024-11-04T19:36:20","modified_gmt":"2024-11-04T11:36:20","slug":"%e6%95%99%e6%82%a8%e4%bd%bf%e7%94%a8sql%e8%aa%9e%e5%8f%a5%e4%bf%ae%e6%94%b9sql%e4%b8%bb%e9%8d%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162975\/","title":{"rendered":"\u6559\u60a8\u4f7f\u7528SQL\u8a9e\u53e5\u4fee\u6539SQL\u4e3b\u9375"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e4%bd%bf%e7%94%a8sql%e8%aa%9e%e5%8f%a5%e4%bf%ae%e6%94%b9sql%e4%b8%bb%e9%8d%b5-GGCVLgJyPl\">\u6559\u60a8\u4f7f\u7528SQL\u8a9e\u53e5\u4fee\u6539SQL\u4e3b\u9375<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u4e3b\u9375\u662f\u7528\u4f86\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u689d\u8a18\u9304\u7684\u91cd\u8981\u5143\u7d20\u3002\u7576\u9700\u8981\u4fee\u6539\u4e3b\u9375\u6642\uff0c\u5fc5\u9808\u8b39\u614e\u64cd\u4f5c\uff0c\u4ee5\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u6216\u4e1f\u5931\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u4f86\u4fee\u6539SQL\u4e3b\u9375\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e4%b8%bb%e9%8d%b5%ef%bc%9f-GGCVLgJyPl\">\u4ec0\u9ebc\u662f\u4e3b\u9375\uff1f<\/h2>\n<p>\u4e3b\u9375\u662f\u8cc7\u6599\u8868\u4e2d\u7684\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\uff0c\u5176\u503c\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u4e0d\u80fd\u70ba\u7a7a\u3002\u4e3b\u9375\u7684\u4e3b\u8981\u529f\u80fd\u662f\u78ba\u4fdd\u6bcf\u4e00\u689d\u8a18\u9304\u7684\u552f\u4e00\u6027\uff0c\u4e26\u4e14\u901a\u5e38\u7528\u65bc\u5efa\u7acb\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e4%bf%ae%e6%94%b9%e4%b8%bb%e9%8d%b5%ef%bc%9f-GGCVLgJyPl\">\u70ba\u4ec0\u9ebc\u9700\u8981\u4fee\u6539\u4e3b\u9375\uff1f<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4fee\u6539\u4e3b\u9375\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u539f\u6709\u4e3b\u9375\u7684\u8a2d\u8a08\u4e0d\u518d\u9069\u5408\u696d\u52d9\u9700\u6c42\u3002<\/li>\n<li>\u9700\u8981\u5408\u4f75\u591a\u500b\u8cc7\u6599\u8868\uff0c\u4e26\u91cd\u65b0\u8a2d\u8a08\u4e3b\u9375\u3002<\/li>\n<li>\u767c\u73fe\u539f\u6709\u4e3b\u9375\u5b58\u5728\u91cd\u8907\u503c\u6216\u7a7a\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bf%ae%e6%94%b9%e4%b8%bb%e9%8d%b5%e7%9a%84%e6%ad%a5%e9%a9%9f-GGCVLgJyPl\">\u4fee\u6539\u4e3b\u9375\u7684\u6b65\u9a5f<\/h2>\n<p>\u4fee\u6539\u4e3b\u9375\u7684\u904e\u7a0b\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u522a\u9664\u73fe\u6709\u7684\u4e3b\u9375\u7d04\u675f\u3002<\/li>\n<li>\u6dfb\u52a0\u65b0\u7684\u4e3b\u9375\u7d04\u675f\u3002<\/li>\n<\/ol>\n<h3 id=\"1-%e5%88%aa%e9%99%a4%e7%8f%be%e6%9c%89%e7%9a%84%e4%b8%bb%e9%8d%b5%e7%b4%84%e6%9d%9f-GGCVLgJyPl\">1. \u522a\u9664\u73fe\u6709\u7684\u4e3b\u9375\u7d04\u675f<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u522a\u9664\u73fe\u6709\u7684\u4e3b\u9375\u7d04\u675f\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP PRIMARY KEY;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u7684\u8cc7\u6599\u8868\u540d\u70ba <code>users<\/code>\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP PRIMARY KEY;<\/code><\/pre>\n<h3 id=\"2-%e6%b7%bb%e5%8a%a0%e6%96%b0%e7%9a%84%e4%b8%bb%e9%8d%b5%e7%b4%84%e6%9d%9f-GGCVLgJyPl\">2. \u6dfb\u52a0\u65b0\u7684\u4e3b\u9375\u7d04\u675f<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u60a8\u53ef\u4ee5\u6dfb\u52a0\u65b0\u7684\u4e3b\u9375\u7d04\u675f\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD PRIMARY KEY (\u6b04\u4f4d\u540d);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u5e0c\u671b\u5c07 <code>user_id<\/code> \u6b04\u4f4d\u8a2d\u7f6e\u70ba\u65b0\u7684\u4e3b\u9375\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD PRIMARY KEY (user_id);<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-GGCVLgJyPl\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4fee\u6539\u4e3b\u9375\u6642\uff0c\u8acb\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u65b0\u7684\u4e3b\u9375\u6b04\u4f4d\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u4e0d\u70ba\u7a7a\u3002<\/li>\n<li>\u5728\u522a\u9664\u4e3b\u9375\u7d04\u675f\u4e4b\u524d\uff0c\u8acb\u78ba\u4fdd\u6c92\u6709\u5176\u4ed6\u8cc7\u6599\u8868\u4f9d\u8cf4\u65bc\u8a72\u4e3b\u9375\u3002<\/li>\n<li>\u5728\u9032\u884c\u4efb\u4f55\u7d50\u69cb\u6027\u8b8a\u66f4\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u8cc7\u6599\u5eab\uff0c\u4ee5\u9632\u6b62\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%84%e4%be%8b-GGCVLgJyPl\">\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u539f\u6709\u7684\u4e3b\u9375\u662f <code>emp_id<\/code>\uff0c\u4f46\u60a8\u5e0c\u671b\u5c07 <code>email<\/code> \u6b04\u4f4d\u8a2d\u7f6e\u70ba\u65b0\u7684\u4e3b\u9375\u3002\u60a8\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\uff1a<\/p>\n<pre><code>-- \u522a\u9664\u73fe\u6709\u7684\u4e3b\u9375\u7d04\u675f\nALTER TABLE employees DROP PRIMARY KEY;\n\n-- \u6dfb\u52a0\u65b0\u7684\u4e3b\u9375\u7d04\u675f\nALTER TABLE employees ADD PRIMARY KEY (email);<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u60a8\u5c31\u6210\u529f\u5730\u5c07\u4e3b\u9375\u5f9e <code>emp_id<\/code> \u4fee\u6539\u70ba <code>email<\/code>\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GGCVLgJyPl\">\u7e3d\u7d50<\/h2>\n<p>\u4fee\u6539SQL\u4e3b\u9375\u662f\u4e00\u500b\u9700\u8981\u8b39\u614e\u64cd\u4f5c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u5230\u522a\u9664\u820a\u7684\u4e3b\u9375\u7d04\u675f\u548c\u6dfb\u52a0\u65b0\u7684\u4e3b\u9375\u7d04\u675f\u3002\u901a\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u60a8\u61c9\u8a72\u80fd\u5920\u7406\u89e3\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u4f86\u9032\u884c\u9019\u4e00\u64cd\u4f5c\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6280\u8853\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u6709\u6548\u5730\u4fee\u6539SQL\u4e3b\u9375\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6280\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u4e00\u81f4\u6027\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-162975","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162975","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=162975"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162975\/revisions"}],"predecessor-version":[{"id":162976,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162975\/revisions\/162976"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}