{"id":179866,"date":"2024-11-09T05:27:18","date_gmt":"2024-11-08T21:27:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179866\/"},"modified":"2024-11-09T05:27:18","modified_gmt":"2024-11-08T21:27:18","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%a8%ad%e7%bd%ae%e9%9b%99%e4%b8%bb%e9%8d%b5%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e5%85%a9%e8%a1%8c%e7%b5%84%e5%90%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179866\/","title":{"rendered":"\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u8a2d\u7f6e\u96d9\u4e3b\u9375\uff1f (\u6578\u64da\u5eab\u8868\u4e2d\u5169\u884c\u7d44\u5408\u70ba\u4e3b\u9375)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%a8%ad%e7%bd%ae%e9%9b%99%e4%b8%bb%e9%8d%b5%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e5%85%a9%e8%a1%8c%e7%b5%84%e5%90%88-rsjFXYkspU\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u8a2d\u7f6e\u96d9\u4e3b\u9375\uff1f 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id=\"%e6%ad%a5%e9%a9%9f1%ef%bc%9a%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84%e5%88%97-rsjFXYkspU\">\u6b65\u9a5f1\uff1a\u9078\u64c7\u5408\u9069\u7684\u5217<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u9078\u64c7\u5c07\u7528\u4f5c\u4e3b\u9375\u7684\u5217\u3002\u9019\u4e9b\u5217\u61c9\u8a72\u80fd\u5920\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u8a02\u55ae\u8868\u4e2d\uff0c\u60a8\u53ef\u80fd\u6703\u9078\u64c7\u7528\u6236ID\u548c\u8a02\u55aeID\u4f5c\u70ba\u96d9\u4e3b\u9375\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f2%ef%bc%9a%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%a1%a8-rsjFXYkspU\">\u6b65\u9a5f2\uff1a\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8868<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u60a8\u9700\u8981\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8868\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SQL \u8a9e\u53e5\u5275\u5efa\u8868\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE Orders (\n    UserID INT,\n    ProductID INT,\n    OrderDate DATETIME,\n    PRIMARY KEY (UserID, ProductID)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba Orders \u7684\u8868\uff0c\u4e26\u5c07 UserID \u548c ProductID \u8a2d\u7f6e\u70ba\u96d9\u4e3b\u9375\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f3%ef%bc%9a%e5%ae%9a%e7%be%a9%e9%9b%99%e4%b8%bb%e9%8d%b5-rsjFXYkspU\">\u6b65\u9a5f3\uff1a\u5b9a\u7fa9\u96d9\u4e3b\u9375<\/h3>\n<p>\u5728\u5275\u5efa\u8868\u6642\uff0c\u60a8\u53ef\u4ee5\u5728 PRIMARY KEY \u5b50\u53e5\u4e2d\u6307\u5b9a\u591a\u500b\u5217\u3002\u9019\u544a\u8a34\u6578\u64da\u5eab\u9019\u4e9b\u5217\u7684\u7d44\u5408\u5fc5\u9808\u662f\u552f\u4e00\u7684\u3002\u60a8\u4e5f\u53ef\u4ee5\u5728\u8868\u5275\u5efa\u5f8c\u4f7f\u7528 ALTER TABLE \u8a9e\u53e5\u4f86\u6dfb\u52a0\u96d9\u4e3b\u9375\uff1a<\/p>\n<pre><code>ALTER TABLE Orders\nADD PRIMARY KEY (UserID, ProductID);<\/code><\/pre>\n<h2 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