{"id":141331,"date":"2024-10-31T21:39:07","date_gmt":"2024-10-31T13:39:07","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141331\/"},"modified":"2024-10-31T21:39:08","modified_gmt":"2024-10-31T13:39:08","slug":"sql-server-%e4%b8%ad%e5%b0%8d%e6%87%89%e9%bb%98%e8%aa%8d%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\/141331\/","title":{"rendered":"SQL Server \u4e2d\u5c0d\u61c9\u9ed8\u8a8d\u7d04\u675f\u7684\u522a\u9664\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"sql-server-%e4%b8%ad%e5%b0%8d%e6%87%89%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95-pIHUSaGnzF\">SQL Server \u4e2d\u5c0d\u61c9\u9ed8\u8a8d\u7d04\u675f\u7684\u522a\u9664\u65b9\u6cd5<\/h1>\n<p>\u5728 SQL Server \u4e2d\uff0c\u9ed8\u8a8d\u7d04\u675f\uff08Default Constraint\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u70ba\u8868\u4e2d\u7684\u5217\u6307\u5b9a\u9ed8\u8a8d\u503c\u7684\u7d04\u675f\u3002\u7576\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u8a72\u5217\u7684\u503c\uff0c\u5247\u6703\u81ea\u52d5\u4f7f\u7528\u9ed8\u8a8d\u503c\u3002\u96d6\u7136\u9ed8\u8a8d\u7d04\u675f\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u522a\u9664\u9019\u4e9b\u7d04\u675f\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 SQL Server \u4e2d\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\u3002<\/p>\n<h2 id=\"%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f%e7%9a%84%e6%a6%82%e5%bf%b5-pIHUSaGnzF\">\u9ed8\u8a8d\u7d04\u675f\u7684\u6982\u5ff5<\/h2>\n<p>\u9ed8\u8a8d\u7d04\u675f\u662f SQL Server \u4e2d\u7684\u4e00\u7a2e\u7d04\u675f\uff0c\u7528\u65bc\u6307\u5b9a\u7576\u63d2\u5165\u6578\u64da\u6642\uff0c\u67d0\u4e00\u5217\u7684\u9ed8\u8a8d\u503c\u3002\u9019\u5c0d\u65bc\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u70ba\u4e00\u500b\u201c\u5275\u5efa\u65e5\u671f\u201d\u5217\u8a2d\u7f6e\u9ed8\u8a8d\u503c\u70ba\u7576\u524d\u65e5\u671f\uff0c\u9019\u6a23\u5728\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u8a72\u5217\u7684\u503c\uff0c\u5247\u6703\u81ea\u52d5\u586b\u5165\u7576\u524d\u65e5\u671f\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f%e7%9a%84%e6%ad%a5%e9%a9%9f-pIHUSaGnzF\">\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u7684\u6b65\u9a5f<\/h2>\n<p>\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u7684\u904e\u7a0b\u76f8\u5c0d\u7c21\u55ae\uff0c\u4e3b\u8981\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e8%aa%8d%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f%e7%9a%84%e5%90%8d%e7%a8%b1-pIHUSaGnzF\">1. \u78ba\u8a8d\u9ed8\u8a8d\u7d04\u675f\u7684\u540d\u7a31<\/h3>\n<p>\u5728\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u77e5\u9053\u8a72\u7d04\u675f\u7684\u540d\u7a31\u3002\u9ed8\u8a8d\u7d04\u675f\u7684\u540d\u7a31\u901a\u5e38\u662f\u5728\u5275\u5efa\u7d04\u675f\u6642\u81ea\u52d5\u751f\u6210\u7684\uff0c\u4f46\u5982\u679c\u60a8\u5728\u5275\u5efa\u6642\u6307\u5b9a\u4e86\u540d\u7a31\uff0c\u5247\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u8a72\u540d\u7a31\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u627e\u8868\u4e2d\u6240\u6709\u7d04\u675f\u7684\u540d\u7a31\uff1a<\/p>\n<pre><code>SELECT \n    OBJECT_NAME(OBJECT_ID) AS ConstraintName,\n    SCHEMA_NAME(schema_id) AS SchemaName,\n    OBJECT_NAME(parent_object_id) AS TableName\nFROM \n    sys.default_constraints\nWHERE \n    parent_object_id = OBJECT_ID('\u60a8\u7684\u8868\u540d');<\/code><\/pre>\n<h3 id=\"2-%e5%88%aa%e9%99%a4%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f-pIHUSaGnzF\">2. \u522a\u9664\u9ed8\u8a8d\u7d04\u675f<\/h3>\n<p>\u4e00\u65e6\u60a8\u78ba\u5b9a\u4e86\u9ed8\u8a8d\u7d04\u675f\u7684\u540d\u7a31\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u522a\u9664\u5b83\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nDROP CONSTRAINT \u7d04\u675f\u540d\u7a31;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u500b\u540d\u70ba\u201cEmployees\u201d\u7684\u8868\uff0c\u4e26\u4e14\u9ed8\u8a8d\u7d04\u675f\u7684\u540d\u7a31\u70ba\u201cDF_Employees_CreationDate\u201d\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u522a\u9664\u8a72\u7d04\u675f\uff1a<\/p>\n<pre><code>ALTER TABLE Employees\nDROP CONSTRAINT DF_Employees_CreationDate;<\/code><\/pre>\n<h3 id=\"3-%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f%e6%98%af%e5%90%a6%e5%b7%b2%e5%88%aa%e9%99%a4-pIHUSaGnzF\">3. \u9a57\u8b49\u7d04\u675f\u662f\u5426\u5df2\u522a\u9664<\/h3>\n<p>\u522a\u9664\u7d04\u675f\u5f8c\uff0c\u60a8\u53ef\u4ee5\u518d\u6b21\u904b\u884c\u7b2c\u4e00\u6b65\u4e2d\u7684\u67e5\u8a62\u4f86\u78ba\u8a8d\u8a72\u7d04\u675f\u662f\u5426\u5df2\u6210\u529f\u522a\u9664\u3002\u5982\u679c\u67e5\u8a62\u7d50\u679c\u4e2d\u4e0d\u518d\u986f\u793a\u8a72\u7d04\u675f\u540d\u7a31\uff0c\u5247\u8868\u793a\u522a\u9664\u6210\u529f\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-pIHUSaGnzF\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u4e4b\u524d\uff0c\u8acb\u78ba\u4fdd\u8a72\u7d04\u675f\u4e0d\u6703\u5f71\u97ff\u5230\u73fe\u6709\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u522a\u9664\u7d04\u675f\u5f8c\uff0c\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u8a72\u5217\u7684\u503c\uff0c\u5247\u8a72\u5217\u5c07\u4e0d\u6703\u81ea\u52d5\u586b\u5165\u4efb\u4f55\u503c\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<li>\u5efa\u8b70\u5728\u522a\u9664\u7d04\u675f\u4e4b\u524d\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-pIHUSaGnzF\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\u662f\u4e00\u500b\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u53ea\u9700\u5e7e\u500b\u6b65\u9a5f\u5373\u53ef\u5b8c\u6210\u3002\u4e86\u89e3\u5982\u4f55\u7ba1\u7406\u9019\u4e9b\u7d04\u675f\u5c0d\u65bc\u7dad\u8b77\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u9ad8\u6548\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\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL Server \u4e2d\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\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-141331","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141331","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=141331"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141331\/revisions"}],"predecessor-version":[{"id":141332,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141331\/revisions\/141332"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}