{"id":168333,"date":"2024-11-06T11:30:17","date_gmt":"2024-11-06T03:30:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168333\/"},"modified":"2024-11-06T11:30:18","modified_gmt":"2024-11-06T03:30:18","slug":"sql-server-%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e5%89%b5%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168333\/","title":{"rendered":"SQL Server \u552f\u4e00\u7d04\u675f\u7684\u5275\u5efa"},"content":{"rendered":"<h1 id=\"sql-server-%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e5%89%b5%e5%bb%ba-DHGunHLfKA\">SQL Server \u552f\u4e00\u7d04\u675f\u7684\u5275\u5efa<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d04\u675f\uff08Constraint\uff09\u662f\u7528\u4f86\u9650\u5236\u8cc7\u6599\u8868\u4e2d\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u7d04\u675f\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u552f\u4e00\u7d04\u675f\uff08UNIQUE Constraint\uff09\u3002\u552f\u4e00\u7d04\u675f\u7684\u4e3b\u8981\u529f\u80fd\u662f\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u7684\u67d0\u4e00\u5217\u6216\u67d0\u5e7e\u5217\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u9632\u6b62\u91cd\u8907\u8cc7\u6599\u7684\u51fa\u73fe\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%ef%bc%9f-DHGunHLfKA\">\u4ec0\u9ebc\u662f\u552f\u4e00\u7d04\u675f\uff1f<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u662f\u4e00\u7a2e\u8cc7\u6599\u5b8c\u6574\u6027\u7d04\u675f\uff0c\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u7684\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u503c\u4e0d\u6703\u91cd\u8907\u3002\u9019\u610f\u5473\u8457\u5728\u8a72\u5217\u4e2d\uff0c\u6240\u6709\u7684\u503c\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u9664\u4e86 NULL \u503c\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u552f\u4e00\u7d04\u675f\u5141\u8a31\u5728\u540c\u4e00\u5217\u4e2d\u5b58\u5728\u591a\u500b NULL \u503c\uff0c\u56e0\u70ba NULL \u88ab\u8996\u70ba\u672a\u77e5\u7684\u503c\uff0c\u4e0d\u6703\u8207\u5176\u4ed6\u503c\u76f8\u7b49\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-DHGunHLfKA\">\u5982\u4f55\u5275\u5efa\u552f\u4e00\u7d04\u675f<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u5728\u5275\u5efa\u8cc7\u6599\u8868\u6642\u6216\u5728\u8cc7\u6599\u8868\u5df2\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u6dfb\u52a0\u552f\u4e00\u7d04\u675f\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e5%9c%a8%e5%89%b5%e5%bb%ba%e8%b3%87%e6%96%99%e8%a1%a8%e6%99%82%e6%b7%bb%e5%8a%a0%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-DHGunHLfKA\">1. \u5728\u5275\u5efa\u8cc7\u6599\u8868\u6642\u6dfb\u52a0\u552f\u4e00\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Employees (\n    EmployeeID INT PRIMARY KEY,\n    Email NVARCHAR(255) UNIQUE,\n    PhoneNumber NVARCHAR(20) UNIQUE\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7bc4\u4f8b\u4e2d\uff0c`Email` \u548c `PhoneNumber` \u5217\u90fd\u88ab\u8a2d\u7f6e\u70ba\u552f\u4e00\u7d04\u675f\uff0c\u9019\u610f\u5473\u8457\u6bcf\u4f4d\u54e1\u5de5\u7684\u96fb\u5b50\u90f5\u4ef6\u548c\u96fb\u8a71\u865f\u78bc\u5fc5\u9808\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%b3%87%e6%96%99%e8%a1%a8%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-DHGunHLfKA\">2. \u5728\u5df2\u5b58\u5728\u7684\u8cc7\u6599\u8868\u4e2d\u6dfb\u52a0\u552f\u4e00\u7d04\u675f<\/h3>\n<pre><code>ALTER TABLE Employees\nADD CONSTRAINT UQ_Email UNIQUE (Email);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 `ALTER TABLE` \u8a9e\u53e5\u4f86\u5411\u5df2\u5b58\u5728\u7684 `Employees` \u8cc7\u6599\u8868\u6dfb\u52a0\u4e00\u500b\u540d\u70ba `UQ_Email` \u7684\u552f\u4e00\u7d04\u675f\uff0c\u78ba\u4fdd `Email` \u5217\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-DHGunHLfKA\">\u552f\u4e00\u7d04\u675f\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u61c9\u7528\u65bc\u591a\u5217\uff0c\u9019\u610f\u5473\u8457\u53ef\u4ee5\u78ba\u4fdd\u591a\u500b\u5217\u7684\u7d44\u5408\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u8cc7\u6599\u6642\uff0c\u5982\u679c\u9055\u53cd\u552f\u4e00\u7d04\u675f\uff0cSQL Server \u5c07\u8fd4\u56de\u932f\u8aa4\uff0c\u4e26\u4e14\u8a72\u64cd\u4f5c\u5c07\u88ab\u62d2\u7d55\u3002<\/li>\n<li>\u552f\u4e00\u7d04\u675f\u4e0d\u6703\u81ea\u52d5\u5275\u5efa\u7d22\u5f15\uff0c\u4f46 SQL Server \u6703\u70ba\u552f\u4e00\u7d04\u675f\u81ea\u52d5\u5275\u5efa\u4e00\u500b\u552f\u4e00\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%a4%9a%e5%88%97%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-DHGunHLfKA\">\u7bc4\u4f8b\uff1a\u591a\u5217\u552f\u4e00\u7d04\u675f<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b `Users` \u8cc7\u6599\u8868\uff0c\u6211\u5011\u5e0c\u671b\u78ba\u4fdd\u6bcf\u4f4d\u7528\u6236\u7684 `FirstName` \u548c `LastName` \u7684\u7d44\u5408\u662f\u552f\u4e00\u7684\u3002\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\uff1a<\/p>\n<pre><code>CREATE TABLE Users (\n    UserID INT PRIMARY KEY,\n    FirstName NVARCHAR(50),\n    LastName NVARCHAR(50),\n    CONSTRAINT UQ_UserName UNIQUE (FirstName, LastName)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c`UQ_UserName` \u662f\u4e00\u500b\u591a\u5217\u552f\u4e00\u7d04\u675f\uff0c\u78ba\u4fdd `FirstName` \u548c `LastName` \u7684\u7d44\u5408\u4e0d\u6703\u91cd\u8907\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DHGunHLfKA\">\u7e3d\u7d50<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u5728 SQL Server \u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u7dad\u8b77\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u9069\u7576\u5730\u4f7f\u7528\u552f\u4e00\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u91cd\u8907\u8cc7\u6599\u7684\u51fa\u73fe\uff0c\u5f9e\u800c\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u8cea\u91cf\u548c\u53ef\u9760\u6027\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 SQL Server\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL Server \u4e2d\u5275\u5efa\u552f\u4e00\u7d04\u675f\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\uff0c\u907f\u514d\u91cd\u8907\u6578\u64da\u7684\u51fa\u73fe\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-168333","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168333","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=168333"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168333\/revisions"}],"predecessor-version":[{"id":168334,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168333\/revisions\/168334"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168333"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}