{"id":141401,"date":"2024-10-31T21:44:45","date_gmt":"2024-10-31T13:44:45","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141401\/"},"modified":"2024-10-31T21:44:46","modified_gmt":"2024-10-31T13:44:46","slug":"sql-server-%e4%b8%ad%e5%a6%82%e4%bd%95%e5%88%aa%e9%99%a4%e6%9c%89%e9%bb%98%e8%aa%8d%e5%80%bc%e7%9a%84%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141401\/","title":{"rendered":"SQL Server \u4e2d\u5982\u4f55\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217"},"content":{"rendered":"

SQL Server \u4e2d\u5982\u4f55\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217<\/h1>\n

\u5728\u4f7f\u7528 SQL Server \u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u6642\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u8868\u9032\u884c\u4fee\u6539\uff0c\u5305\u62ec\u522a\u9664\u5217\u3002\u7576\u4e00\u500b\u5217\u8a2d\u7f6e\u4e86\u9ed8\u8a8d\u503c\u6642\uff0c\u522a\u9664\u9019\u500b\u5217\u7684\u904e\u7a0b\u53ef\u80fd\u6703\u7a0d\u5fae\u8907\u96dc\u4e00\u4e9b\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728 SQL Server \u4e2d\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\u3002<\/p>\n

\u7406\u89e3\u9ed8\u8a8d\u503c<\/h2>\n

\u5728 SQL Server \u4e2d\uff0c\u9ed8\u8a8d\u503c\u662f\u6307\u5728\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u6c92\u6709\u70ba\u67d0\u500b\u5217\u63d0\u4f9b\u503c\uff0c\u5247\u81ea\u52d5\u4f7f\u7528\u7684\u503c\u3002\u9019\u4e9b\u9ed8\u8a8d\u503c\u53ef\u4ee5\u662f\u5e38\u6578\u3001\u51fd\u6578\u6216\u8868\u9054\u5f0f\u3002\u7576\u4e00\u500b\u5217\u6709\u9ed8\u8a8d\u503c\u6642\uff0c\u522a\u9664\u9019\u500b\u5217\u9700\u8981\u5148\u8655\u7406\u8207\u4e4b\u76f8\u95dc\u7684\u9ed8\u8a8d\u7d04\u675f\u3002<\/p>\n

\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217\u7684\u6b65\u9a5f<\/h2>\n

\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217\u7684\u904e\u7a0b\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n

\u6b65\u9a5f 1: \u78ba\u8a8d\u9ed8\u8a8d\u7d04\u675f<\/h3>\n

\u5728\u522a\u9664\u5217\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u78ba\u8a8d\u8a72\u5217\u662f\u5426\u6709\u9ed8\u8a8d\u7d04\u675f\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\uff1a<\/p>\n

SELECT \n    OBJECT_NAME(object_id) AS ConstraintName,\n    COL_NAME(parent_object_id, parent_column_id) AS ColumnName\nFROM \n    sys.default_constraints\nWHERE \n    parent_object_id = OBJECT_ID('\u4f60\u7684\u8868\u540d');<\/code><\/pre>\n
\u5c07\u201c\u4f60\u7684\u8868\u540d\u201d\u66ff\u63db\u70ba\u5be6\u969b\u7684\u8868\u540d\uff0c\u9019\u6a23\u53ef\u4ee5\u5217\u51fa\u6240\u6709\u8207\u8a72\u8868\u76f8\u95dc\u7684\u9ed8\u8a8d\u7d04\u675f\u3002<\/p>\n
\u6b65\u9a5f 2: \u522a\u9664\u9ed8\u8a8d\u7d04\u675f<\/h3>\n
\u5982\u679c\u78ba\u8a8d\u4e86\u8a72\u5217\u6709\u9ed8\u8a8d\u7d04\u675f\uff0c\u5247\u9700\u8981\u5148\u522a\u9664\u9019\u500b\u7d04\u675f\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\uff1a<\/p>\n
ALTER TABLE \u4f60\u7684\u8868\u540d\nDROP CONSTRAINT \u7d04\u675f\u540d\u7a31;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0c\u5c07\u201c\u7d04\u675f\u540d\u7a31\u201d\u66ff\u63db\u70ba\u5f9e\u7b2c\u4e00\u6b65\u67e5\u8a62\u4e2d\u7372\u5f97\u7684\u7d04\u675f\u540d\u7a31\u3002<\/p>\n
\u6b65\u9a5f 3: \u522a\u9664\u5217<\/h3>\n
\u4e00\u65e6\u9ed8\u8a8d\u7d04\u675f\u88ab\u522a\u9664\uff0c\u5c31\u53ef\u4ee5\u5b89\u5168\u5730\u522a\u9664\u8a72\u5217\u3002\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u522a\u9664\u5217\uff1a<\/p>\n
ALTER TABLE \u4f60\u7684\u8868\u540d\nDROP COLUMN \u5217\u540d;<\/code><\/pre>\n
\u5c07\u201c\u5217\u540d\u201d\u66ff\u63db\u70ba\u4f60\u60f3\u8981\u522a\u9664\u7684\u5217\u7684\u540d\u7a31\u3002<\/p>\n
\u793a\u4f8b<\/h2>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba Employees<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u500b\u540d\u70ba Department<\/code> \u7684\u5217\uff0c\u4e26\u4e14\u8a72\u5217\u6709\u4e00\u500b\u9ed8\u8a8d\u503c\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u9019\u500b\u5217\u7684\u5177\u9ad4\u6b65\u9a5f\uff1a<\/p>\n
    \n
  1. \u6aa2\u67e5\u9ed8\u8a8d\u7d04\u675f\uff1a<\/li>\n
    SELECT \n        OBJECT_NAME(object_id) AS ConstraintName,\n        COL_NAME(parent_object_id, parent_column_id) AS ColumnName\n    FROM \n        sys.default_constraints\n    WHERE \n        parent_object_id = OBJECT_ID('Employees');<\/code><\/pre>\n
  2. \u5047\u8a2d\u67e5\u8a62\u7d50\u679c\u986f\u793a\u7d04\u675f\u540d\u7a31\u70ba DF_Employees_Department<\/code>\uff0c\u5247\u522a\u9664\u9ed8\u8a8d\u7d04\u675f\uff1a<\/li>\n
    ALTER TABLE Employees\n    DROP CONSTRAINT DF_Employees_Department;<\/code><\/pre>\n
  3. \u6700\u5f8c\uff0c\u522a\u9664 Department<\/code> \u5217\uff1a<\/li>\n
    ALTER TABLE Employees\n    DROP COLUMN Department;<\/code><\/pre>\n<\/ol>\n
    \u6ce8\u610f\u4e8b\u9805<\/h2>\n
    \u5728\u522a\u9664\u5217\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002\u6b64\u5916\uff0c\u522a\u9664\u5217\u7684\u64cd\u4f5c\u662f\u4e0d\u53ef\u9006\u7684\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u6b64\u64cd\u4f5c\u4e4b\u524d\uff0c\u8acb\u78ba\u4fdd\u8a72\u5217\u4e0d\u518d\u9700\u8981\u3002<\/p>\n
    \u7e3d\u7d50<\/h2>\n
    \u5728 SQL Server \u4e2d\u522a\u9664\u6709\u9ed8\u8a8d\u503c\u7684\u5217\u9700\u8981\u9075\u5faa\u4e00\u5b9a\u7684\u6b65\u9a5f\uff0c\u5305\u62ec\u78ba\u8a8d\u9ed8\u8a8d\u7d04\u675f\u3001\u522a\u9664\u7d04\u675f\u4ee5\u53ca\u6700\u7d42\u522a\u9664\u5217\u3002\u9019\u4e9b\u64cd\u4f5c\u96d6\u7136\u7c21\u55ae\uff0c\u4f46\u5728\u5be6\u969b\u64cd\u4f5c\u4e2d\u4ecd\u9700\u8b39\u614e\uff0c\u4ee5\u907f\u514d\u6578\u64da\u4e1f\u5931\u6216\u5176\u4ed6\u554f\u984c\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u53ef\u9760\u7684 \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":"
    \u4e86\u89e3\u5982\u4f55\u5728 SQL Server \u4e2d\u522a\u9664\u5177\u6709\u9ed8\u8a8d\u503c\u7684\u5217\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u4e26\u907f\u514d\u6f5b\u5728\u932f\u8aa4\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-141401","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141401","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=141401"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141401\/revisions"}],"predecessor-version":[{"id":141402,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141401\/revisions\/141402"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}