{"id":180860,"date":"2024-11-09T13:47:18","date_gmt":"2024-11-09T05:47:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180860\/"},"modified":"2024-11-09T13:47:19","modified_gmt":"2024-11-09T05:47:19","slug":"%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3sql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8f%8f%e8%bf%b0%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7%e8%88%87%e6%8a%80%e5%b7%a7-sql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180860\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3SQL\u6578\u64da\u5eab\u63cf\u8ff0\u7684\u5fc5\u8981\u6027\u8207\u6280\u5de7 (sql\u6578\u64da\u5eab\u63cf\u8ff0)"},"content":{"rendered":"<h1 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id=\"sql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8f%8f%e8%bf%b0%e7%9a%84%e6%8a%80%e5%b7%a7-LDERTYADWj\">SQL\u6578\u64da\u5eab\u63cf\u8ff0\u7684\u6280\u5de7<\/h2>\n<p>\u70ba\u4e86\u6709\u6548\u5730\u63cf\u8ff0SQL\u6578\u64da\u5eab\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u500b\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8er%e5%9c%96%ef%bc%88%e5%af%a6%e9%ab%94%e9%97%9c%e4%bf%82%e5%9c%96%ef%bc%89-LDERTYADWj\">1. \u4f7f\u7528ER\u5716\uff08\u5be6\u9ad4\u95dc\u4fc2\u5716\uff09<\/h3>\n<p>ER\u5716\u662f\u4e00\u7a2e\u53ef\u8996\u5316\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u7406\u89e3\u6578\u64da\u5eab\u4e2d\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\u3002\u901a\u904e\u7e6a\u88fdER\u5716\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6e05\u6670\u5730\u770b\u5230\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u9019\u5c0d\u65bc\u8a2d\u8a08\u548c\u63cf\u8ff0\u6578\u64da\u5eab\u7d50\u69cb\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/p>\n<h3 id=\"2-%e6%98%8e%e7%a2%ba%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-LDERTYADWj\">2. \u660e\u78ba\u5b57\u6bb5\u985e\u578b<\/h3>\n<p>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u70ba\u6bcf\u500b\u5b57\u6bb5\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u5f71\u97ff\u6578\u64da\u7684\u5b58\u5132\u6548\u7387\uff0c\u9084\u5f71\u97ff\u67e5\u8a62\u7684\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u65e5\u671f\u985e\u578b\u7684\u5b57\u6bb5\uff0c\u61c9\u4f7f\u7528 <code>DATE<\/code> \u6216 <code>DATETIME<\/code> \u985e\u578b\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u5b57\u7b26\u4e32\u985e\u578b\u3002<\/p>\n<h3 id=\"3-%e6%b7%bb%e5%8a%a0%e8%a8%bb%e9%87%8b-LDERTYADWj\">3. \u6dfb\u52a0\u8a3b\u91cb<\/h3>\n<p>\u5728SQL\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u8a3b\u91cb\u4f86\u63cf\u8ff0\u8868\u548c\u5b57\u6bb5\u7684\u7528\u9014\u3002\u9019\u6a23\uff0c\u7576\u5176\u4ed6\u958b\u767c\u8005\u67e5\u770b\u6578\u64da\u5eab\u6642\uff0c\u53ef\u4ee5\u5feb\u901f\u7406\u89e3\u6bcf\u500b\u5b57\u6bb5\u7684\u610f\u7fa9\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL, -- \u7528\u6236\u540d\n    email VARCHAR(100) NOT NULL,    -- \u96fb\u5b50\u90f5\u4ef6\n    created_at DATETIME DEFAULT CURRENT_TIMESTAMP -- \u5275\u5efa\u6642\u9593\n);<\/code><\/pre>\n<h3 id=\"4-%e5%ae%9a%e6%9c%9f%e6%9b%b4%e6%96%b0%e6%96%87%e6%aa%94-LDERTYADWj\">4. 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