{"id":138487,"date":"2024-10-31T14:53:18","date_gmt":"2024-10-31T06:53:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138487\/"},"modified":"2024-10-31T14:53:19","modified_gmt":"2024-10-31T06:53:19","slug":"sql-server%e5%89%b5%e5%bb%ba%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bb%a3%e7%a2%bc%e9%81%8b%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138487\/","title":{"rendered":"SQL Server\u5275\u5efa\u7d04\u675f\u7684\u4ee3\u78bc\u904b\u7528"},"content":{"rendered":"<h1 id=\"sql-server%e5%89%b5%e5%bb%ba%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bb%a3%e7%a2%bc%e9%81%8b%e7%94%a8-PfoDVvPHDQ\">SQL Server\u5275\u5efa\u7d04\u675f\u7684\u4ee3\u78bc\u904b\u7528<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d04\u675f\uff08Constraints\uff09\u662f\u7528\u4f86\u9650\u5236\u8cc7\u6599\u8868\u4e2d\u8cc7\u6599\u7684\u6709\u6548\u6027\u548c\u5b8c\u6574\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002SQL Server\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d04\u675f\u985e\u578b\u4f86\u78ba\u4fdd\u8cc7\u6599\u7684\u6b63\u78ba\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u4e2d\u5275\u5efa\u7d04\u675f\u7684\u4ee3\u78bc\u904b\u7528\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u89e3\u91cb\u3002<\/p>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e9%a1%9e%e5%9e%8b-PfoDVvPHDQ\">\u7d04\u675f\u7684\u985e\u578b<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u7d04\u675f\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u4e3b\u9375\u7d04\u675f\uff08PRIMARY KEY\uff09<\/strong>\uff1a\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u4e0d\u5141\u8a31\u7a7a\u503c\u3002<\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\uff08FOREIGN KEY\uff09<\/strong>\uff1a\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u78ba\u4fdd\u5916\u9375\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u5728\u4e3b\u9375\u6b04\u4f4d\u4e2d\u5b58\u5728\u3002<\/li>\n<li><strong>\u552f\u4e00\u7d04\u675f\uff08UNIQUE\uff09<\/strong>\uff1a\u78ba\u4fdd\u67d0\u4e00\u6b04\u4f4d\u7684\u503c\u5728\u8cc7\u6599\u8868\u4e2d\u662f\u552f\u4e00\u7684\uff0c\u4f46\u5141\u8a31\u7a7a\u503c\u3002<\/li>\n<li><strong>\u6aa2\u67e5\u7d04\u675f\uff08CHECK\uff09<\/strong>\uff1a\u7528\u65bc\u9650\u5236\u67d0\u4e00\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u7b26\u5408\u7279\u5b9a\u7684\u689d\u4ef6\u3002<\/li>\n<li><strong>\u9810\u8a2d\u7d04\u675f\uff08DEFAULT\uff09<\/strong>\uff1a\u70ba\u67d0\u4e00\u6b04\u4f4d\u8a2d\u5b9a\u9810\u8a2d\u503c\uff0c\u7576\u63d2\u5165\u8cc7\u6599\u6642\u672a\u63d0\u4f9b\u8a72\u6b04\u4f4d\u7684\u503c\u6642\uff0c\u5c07\u4f7f\u7528\u9810\u8a2d\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%89%b5%e5%bb%ba%e7%b4%84%e6%9d%9f%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-PfoDVvPHDQ\">\u5275\u5efa\u7d04\u675f\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u5275\u5efa\u7d04\u675f\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nADD CONSTRAINT \u7d04\u675f\u540d \u7d04\u675f\u985e\u578b (\u6b04\u4f4d\u540d);<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u5404\u7a2e\u7d04\u675f\u7684\u5177\u9ad4\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e4%b8%bb%e9%8d%b5%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">1. \u5275\u5efa\u4e3b\u9375\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Customers (\n    CustomerID int NOT NULL,\n    CustomerName varchar(255) NOT NULL,\n    PRIMARY KEY (CustomerID)\n);<\/code><\/pre>\n<h3 id=\"2-%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">2. \u5275\u5efa\u5916\u9375\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Orders (\n    OrderID int NOT NULL,\n    CustomerID int,\n    PRIMARY KEY (OrderID),\n    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)\n);<\/code><\/pre>\n<h3 id=\"3-%e5%89%b5%e5%bb%ba%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">3. \u5275\u5efa\u552f\u4e00\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Employees (\n    EmployeeID int NOT NULL,\n    Email varchar(255) NOT NULL,\n    UNIQUE (Email)\n);<\/code><\/pre>\n<h3 id=\"4-%e5%89%b5%e5%bb%ba%e6%aa%a2%e6%9f%a5%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">4. \u5275\u5efa\u6aa2\u67e5\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Products (\n    ProductID int NOT NULL,\n    Price decimal(10, 2) NOT NULL,\n    CHECK (Price &gt; 0)\n);<\/code><\/pre>\n<h3 id=\"5-%e5%89%b5%e5%bb%ba%e9%a0%90%e8%a8%ad%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">5. \u5275\u5efa\u9810\u8a2d\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Orders (\n    OrderID int NOT NULL,\n    OrderDate datetime DEFAULT GETDATE()\n);<\/code><\/pre>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bf%ae%e6%94%b9%e8%88%87%e5%88%aa%e9%99%a4-PfoDVvPHDQ\">\u7d04\u675f\u7684\u4fee\u6539\u8207\u522a\u9664<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4fee\u6539\u6216\u522a\u9664\u5df2\u5b58\u5728\u7684\u7d04\u675f\u3002\u4ee5\u4e0b\u662f\u76f8\u95dc\u7684\u8a9e\u6cd5\uff1a<\/p>\n<h3 id=\"%e4%bf%ae%e6%94%b9%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">\u4fee\u6539\u7d04\u675f<\/h3>\n<p>SQL Server\u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\u7d04\u675f\uff0c\u60a8\u9700\u8981\u5148\u522a\u9664\u539f\u6709\u7684\u7d04\u675f\uff0c\u7136\u5f8c\u91cd\u65b0\u5275\u5efa\u65b0\u7684\u7d04\u675f\u3002<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nDROP CONSTRAINT \u7d04\u675f\u540d;\n\nALTER TABLE \u8868\u540d\nADD CONSTRAINT \u65b0\u7d04\u675f\u540d \u7d04\u675f\u985e\u578b (\u6b04\u4f4d\u540d);<\/code><\/pre>\n<h3 id=\"%e5%88%aa%e9%99%a4%e7%b4%84%e6%9d%9f-PfoDVvPHDQ\">\u522a\u9664\u7d04\u675f<\/h3>\n<pre><code>ALTER TABLE \u8868\u540d\nDROP CONSTRAINT \u7d04\u675f\u540d;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PfoDVvPHDQ\">\u7e3d\u7d50<\/h2>\n<p>\u7d04\u675f\u5728SQL Server\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5e6b\u52a9\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u6b63\u78ba\u6027\u3002\u901a\u904e\u4f7f\u7528\u4e3b\u9375\u3001\u5916\u9375\u3001\u552f\u4e00\u3001\u6aa2\u67e5\u548c\u9810\u8a2d\u7d04\u675f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u8cc7\u6599\u8868\u4e2d\u7684\u8cc7\u6599\u3002\u4e86\u89e3\u5982\u4f55\u5275\u5efa\u3001\u4fee\u6539\u548c\u522a\u9664\u9019\u4e9b\u7d04\u675f\uff0c\u5c0d\u65bc\u4efb\u4f55\u4f7f\u7528SQL Server\u7684\u958b\u767c\u8005\u4f86\u8aaa\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728SQL Server\u4e2d\u5275\u5efa\u7d04\u675f\u7684\u4ee3\u78bc\u904b\u7528\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\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-138487","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138487","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=138487"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138487\/revisions"}],"predecessor-version":[{"id":138488,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138487\/revisions\/138488"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138487"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138487"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}