{"id":143723,"date":"2024-11-01T00:37:26","date_gmt":"2024-10-31T16:37:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143723\/"},"modified":"2024-11-01T00:37:27","modified_gmt":"2024-10-31T16:37:27","slug":"sql-server-%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143723\/","title":{"rendered":"SQL Server \u552f\u4e00\u7d04\u675f\u7684\u522a\u9664\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"sql-server-%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95-HGXfyDdNZb\">SQL Server \u552f\u4e00\u7d04\u675f\u7684\u522a\u9664\u65b9\u6cd5<\/h1>\n<p>\u5728 SQL Server \u4e2d\uff0c\u552f\u4e00\u7d04\u675f\uff08Unique Constraint\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u67d0\u4e00\u5217\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u7d04\u675f\u689d\u4ef6\u3002\u9019\u610f\u5473\u8457\u5728\u8a72\u5217\u4e2d\u4e0d\u5141\u8a31\u6709\u91cd\u8907\u7684\u503c\u3002\u552f\u4e00\u7d04\u675f\u901a\u5e38\u7528\u65bc\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u552f\u4e00\u8b58\u5225\u67d0\u4e00\u884c\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f8b\u5982\u7528\u6236\u540d\u6216\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-HGXfyDdNZb\">\u552f\u4e00\u7d04\u675f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u61c9\u7528\u65bc\u4e00\u500b\u6216\u591a\u500b\u5217\u3002\u7576\u552f\u4e00\u7d04\u675f\u88ab\u8a2d\u7f6e\u5728\u67d0\u4e00\u5217\u4e0a\u6642\uff0cSQL Server \u6703\u81ea\u52d5\u6aa2\u67e5\u8a72\u5217\u7684\u503c\uff0c\u4e26\u5728\u63d2\u5165\u6216\u66f4\u65b0\u8cc7\u6599\u6642\u78ba\u4fdd\u4e0d\u6703\u6709\u91cd\u8907\u7684\u503c\u3002\u82e5\u5617\u8a66\u63d2\u5165\u91cd\u8907\u7684\u503c\uff0cSQL Server \u5c07\u8fd4\u56de\u932f\u8aa4\u3002<\/p>\n<h3 id=\"%e5%89%b5%e5%bb%ba%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-HGXfyDdNZb\">\u5275\u5efa\u552f\u4e00\u7d04\u675f<\/h3>\n<p>\u5728\u5275\u5efa\u8cc7\u6599\u8868\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\uff1a<\/p>\n<pre><code>CREATE TABLE Users (\n    UserID INT PRIMARY KEY,\n    Username NVARCHAR(50) UNIQUE,\n    Email NVARCHAR(100) UNIQUE\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>Username<\/code> \u548c <code>Email<\/code> \u5217\u90fd\u88ab\u8a2d\u7f6e\u70ba\u552f\u4e00\u7d04\u675f\uff0c\u9019\u610f\u5473\u8457\u6bcf\u500b\u7528\u6236\u7684\u7528\u6236\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u5fc5\u9808\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e7%9a%84%e6%96%b9%e6%b3%95-HGXfyDdNZb\">\u522a\u9664\u552f\u4e00\u7d04\u675f\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u522a\u9664\u5df2\u7d93\u5b58\u5728\u7684\u552f\u4e00\u7d04\u675f\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u552f\u4e00\u7d04\u675f\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nDROP CONSTRAINT \u7d04\u675f\u540d;<\/code><\/pre>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%88%aa%e9%99%a4%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-HGXfyDdNZb\">\u793a\u4f8b\uff1a\u522a\u9664\u552f\u4e00\u7d04\u675f<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Users<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u4e26\u4e14\u6211\u5011\u60f3\u8981\u522a\u9664 <code>Username<\/code> \u5217\u4e0a\u7684\u552f\u4e00\u7d04\u675f\u3002\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u77e5\u9053\u8a72\u7d04\u675f\u7684\u540d\u7a31\u3002\u901a\u5e38\uff0cSQL Server \u6703\u81ea\u52d5\u751f\u6210\u7d04\u675f\u540d\u7a31\uff0c\u4f46\u60a8\u4e5f\u53ef\u4ee5\u5728\u5275\u5efa\u7d04\u675f\u6642\u6307\u5b9a\u540d\u7a31\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u552f\u4e00\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>ALTER TABLE Users\nDROP CONSTRAINT UQ_Username;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>UQ_Username<\/code> \u662f\u552f\u4e00\u7d04\u675f\u7684\u540d\u7a31\u3002\u57f7\u884c\u9019\u689d\u8a9e\u53e5\u5f8c\uff0c<code>Username<\/code> \u5217\u5c07\u4e0d\u518d\u5177\u6709\u552f\u4e00\u7d04\u675f\uff0c\u9019\u610f\u5473\u8457\u53ef\u4ee5\u63d2\u5165\u91cd\u8907\u7684\u7528\u6236\u540d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-HGXfyDdNZb\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u522a\u9664\u552f\u4e00\u7d04\u675f\u4e4b\u524d\uff0c\u8acb\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u4e0d\u6703\u56e0\u70ba\u522a\u9664\u7d04\u675f\u800c\u5c0e\u81f4\u8cc7\u6599\u4e0d\u4e00\u81f4\u3002<\/li>\n<li>\u522a\u9664\u552f\u4e00\u7d04\u675f\u5f8c\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u8003\u616e\u5176\u4ed6\u65b9\u6cd5\u4f86\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\uff0c\u4f8b\u5982\u4f7f\u7528\u89f8\u767c\u5668\u6216\u61c9\u7528\u5c64\u908f\u8f2f\u3002<\/li>\n<li>\u5728\u522a\u9664\u7d04\u675f\u6642\uff0c\u8acb\u52d9\u5fc5\u5c0f\u5fc3\uff0c\u4ee5\u514d\u5f71\u97ff\u5230\u8cc7\u6599\u5eab\u7684\u6574\u9ad4\u7d50\u69cb\u548c\u529f\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HGXfyDdNZb\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u552f\u4e00\u7d04\u675f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8cc7\u6599\u5b8c\u6574\u6027\u5de5\u5177\uff0c\u80fd\u5920\u78ba\u4fdd\u8cc7\u6599\u7684\u552f\u4e00\u6027\u3002\u522a\u9664\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u901a\u904e <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u5be6\u73fe\uff0c\u4f46\u5728\u9032\u884c\u6b64\u64cd\u4f5c\u6642\uff0c\u5fc5\u9808\u8b39\u614e\u8003\u616e\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u7ba1\u7406\u8cc7\u6599\u5eab\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL Server \u4e2d\u522a\u9664\u552f\u4e00\u7d04\u675f\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u4e00\u81f4\u6027\uff0c\u7c21\u5316\u6578\u64da\u5eab\u7ba1\u7406\u6d41\u7a0b\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-143723","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143723","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=143723"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143723\/revisions"}],"predecessor-version":[{"id":143724,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143723\/revisions\/143724"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}