{"id":186422,"date":"2024-11-11T05:47:21","date_gmt":"2024-11-10T21:47:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186422\/"},"modified":"2024-11-11T05:47:22","modified_gmt":"2024-11-10T21:47:22","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e7%b4%84%e6%9d%9f%e8%a6%8f%e5%89%87%e8%88%87%e5%ae%9a%e7%be%a9%e8%a9%b3%e8%a7%a3%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a3%a1%e9%9d%a2%e7%9a%84%e7%b4%84%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186422\/","title":{"rendered":"\u6578\u64da\u5eab\u7684\u7d04\u675f\u898f\u5247\u8207\u5b9a\u7fa9\u8a73\u89e3\uff08\u6578\u64da\u5eab\u88e1\u9762\u7684\u7d04\u675f\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e7%b4%84%e6%9d%9f%e8%a6%8f%e5%89%87%e8%88%87%e5%ae%9a%e7%be%a9%e8%a9%b3%e8%a7%a3%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a3%a1%e9%9d%a2%e7%9a%84%e7%b4%84%e6%9d%9f-vdjIJOOEda\">\u6578\u64da\u5eab\u7684\u7d04\u675f\u898f\u5247\u8207\u5b9a\u7fa9\u8a73\u89e3\uff08\u6578\u64da\u5eab\u88e1\u9762\u7684\u7d04\u675f\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d04\u675f\u898f\u5247\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u91cd\u8981\u6a5f\u5236\u3002\u9019\u4e9b\u7d04\u675f\u898f\u5247\u5b9a\u7fa9\u4e86\u6578\u64da\u8868\u4e2d\u6578\u64da\u7684\u6709\u6548\u6027\uff0c\u4e26\u9650\u5236\u4e86\u6578\u64da\u7684\u8f38\u5165\u65b9\u5f0f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u4e2d\u7684\u5404\u7a2e\u7d04\u675f\u898f\u5247\u53ca\u5176\u5b9a\u7fa9\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e00\u91cd\u8981\u6982\u5ff5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%84%e6%9d%9f%ef%bc%9f-vdjIJOOEda\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u7d04\u675f\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u7d04\u675f\u662f\u7528\u4f86\u9650\u5236\u6578\u64da\u8868\u4e2d\u6578\u64da\u7684\u7279\u6027\u548c\u884c\u70ba\u7684\u898f\u5247\u3002\u9019\u4e9b\u7d04\u675f\u53ef\u4ee5\u9632\u6b62\u4e0d\u6b63\u78ba\u6216\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u9032\u5165\u6578\u64da\u5eab\uff0c\u5f9e\u800c\u4fdd\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u7d04\u675f\u901a\u5e38\u5728\u5275\u5efa\u8868\u6642\u5b9a\u7fa9\uff0c\u4e5f\u53ef\u4ee5\u5728\u8868\u5275\u5efa\u5f8c\u9032\u884c\u4fee\u6539\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%84%e6%9d%9f%e9%a1%9e%e5%9e%8b-vdjIJOOEda\">\u5e38\u898b\u7684\u6578\u64da\u5eab\u7d04\u675f\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u4e3b\u9375\u7d04\u675f\uff08Primary Key Constraint\uff09<\/strong><\/li>\n<p>\u4e3b\u9375\u7d04\u675f\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u6578\u64da\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u3002\u6bcf\u500b\u8868\u53ea\u80fd\u6709\u4e00\u500b\u4e3b\u9375\uff0c\u4e3b\u9375\u7684\u503c\u4e0d\u80fd\u70ba\u7a7a\uff0c\u4e14\u5fc5\u9808\u552f\u4e00\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE Users (\n        UserID INT PRIMARY KEY,\n        UserName VARCHAR(100)\n    );<\/code><\/pre>\n<li><strong>\u5916\u9375\u7d04\u675f\uff08Foreign Key Constraint\uff09<\/strong><\/li>\n<p>\u5916\u9375\u7d04\u675f\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u5b83\u78ba\u4fdd\u4e00\u500b\u8868\u4e2d\u7684\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u5fc5\u9808\u5b58\u5728\u65bc\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE Orders (\n        OrderID INT PRIMARY KEY,\n        UserID INT,\n        FOREIGN KEY (UserID) REFERENCES Users(UserID)\n    );<\/code><\/pre>\n<li><strong>\u552f\u4e00\u7d04\u675f\uff08Unique Constraint\uff09<\/strong><\/li>\n<p>\u552f\u4e00\u7d04\u675f\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u5728\u6574\u500b\u8868\u4e2d\u662f\u552f\u4e00\u7684\uff0c\u4f46\u5141\u8a31\u7a7a\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE Products (\n        ProductID INT PRIMARY KEY,\n        ProductCode VARCHAR(50) UNIQUE\n    );<\/code><\/pre>\n<li><strong>\u6aa2\u67e5\u7d04\u675f\uff08Check Constraint\uff09<\/strong><\/li>\n<p>\u6aa2\u67e5\u7d04\u675f\u7528\u65bc\u9650\u5236\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u5fc5\u9808\u6eff\u8db3\u7279\u5b9a\u689d\u4ef6\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE Employees (\n        EmployeeID INT PRIMARY KEY,\n        Age INT CHECK (Age &gt;= 18)\n    );<\/code><\/pre>\n<li><strong>\u975e\u7a7a\u7d04\u675f\uff08Not Null Constraint\uff09<\/strong><\/li>\n<p>\u975e\u7a7a\u7d04\u675f\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u4e0d\u80fd\u70ba\u7a7a\u3002\u9019\u5c0d\u65bc\u5fc5\u9808\u63d0\u4f9b\u7684\u6578\u64da\u7279\u5225\u91cd\u8981\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE Customers (\n        CustomerID INT PRIMARY KEY,\n        CustomerName VARCHAR(100) NOT NULL\n    );<\/code><\/pre>\n<\/ul>\n<h2 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