{"id":138453,"date":"2024-10-31T14:36:17","date_gmt":"2024-10-31T06:36:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138453\/"},"modified":"2024-10-31T14:36:17","modified_gmt":"2024-10-31T06:36:17","slug":"sql-server%e6%9f%a5%e6%89%be%e8%88%87%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%a1%88%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138453\/","title":{"rendered":"SQL Server\u67e5\u627e\u8207\u91cd\u8907\u8a18\u9304\u7684\u522a\u9664\u65b9\u6848\u63cf\u8ff0"},"content":{"rendered":"<h1 id=\"sql-server%e6%9f%a5%e6%89%be%e8%88%87%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%a1%88%e6%8f%8f%e8%bf%b0-LbYzTZZnps\">SQL Server\u67e5\u627e\u8207\u91cd\u8907\u8a18\u9304\u7684\u522a\u9664\u65b9\u6848\u63cf\u8ff0<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u751a\u81f3\u9020\u6210\u696d\u52d9\u6c7a\u7b56\u7684\u932f\u8aa4\u3002\u56e0\u6b64\uff0c\u53ca\u6642\u67e5\u627e\u4e26\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u7dad\u8b77\u6578\u64da\u5eab\u5065\u5eb7\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728SQL Server\u4e2d\u67e5\u627e\u8207\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u5e7e\u7a2e\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%ae%9a%e7%be%a9-LbYzTZZnps\">\u91cd\u8907\u8a18\u9304\u7684\u5b9a\u7fa9<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u662f\u6307\u5728\u6578\u64da\u8868\u4e2d\uff0c\u67d0\u4e9b\u884c\u7684\u6578\u64da\u5b8c\u5168\u76f8\u540c\u6216\u5728\u7279\u5b9a\u5217\u4e0a\u76f8\u540c\u7684\u60c5\u6cc1\u3002\u9019\u4e9b\u91cd\u8907\u7684\u6578\u64da\u53ef\u80fd\u662f\u7531\u65bc\u6578\u64da\u5c0e\u5165\u932f\u8aa4\u3001\u7528\u6236\u8f38\u5165\u932f\u8aa4\u6216\u7cfb\u7d71\u6545\u969c\u7b49\u539f\u56e0\u9020\u6210\u7684\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-LbYzTZZnps\">\u67e5\u627e\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528GROUP BY\u8a9e\u53e5\u7d50\u5408HAVING\u5b50\u53e5\u4f86\u67e5\u627e\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cCustomers\u201d\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/p>\n<pre><code>SELECT Email, COUNT(*) AS Count\nFROM Customers\nGROUP BY Email\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u9019\u6bb5SQL\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002\u901a\u904e\u9019\u7a2e\u65b9\u5f0f\uff0c\u6211\u5011\u53ef\u4ee5\u5feb\u901f\u8b58\u5225\u51fa\u54ea\u4e9b\u8a18\u9304\u662f\u91cd\u8907\u7684\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-LbYzTZZnps\">\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u5f0f\u6709\u591a\u7a2e\uff0c\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-LbYzTZZnps\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u4f7f\u7528CTE\u53ef\u4ee5\u65b9\u4fbf\u5730\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY Email ORDER BY (SELECT NULL)) AS RowNum\n    FROM Customers\n)\nDELETE FROM CTE WHERE RowNum &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528ROW_NUMBER()\u51fd\u6578\u70ba\u6bcf\u500b\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u5206\u914d\u4e00\u500b\u5e8f\u865f\uff0c\u7136\u5f8c\u522a\u9664\u5e8f\u865f\u5927\u65bc1\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u4fdd\u7559\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u552f\u4e00\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8-LbYzTZZnps\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u81e8\u6642\u8868<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u5c07\u552f\u4e00\u8a18\u9304\u63d2\u5165\u5230\u81e8\u6642\u8868\u4e2d\uff0c\u7136\u5f8c\u518d\u5c07\u5176\u63d2\u5165\u56de\u539f\u59cb\u8868\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT DISTINCT *\nINTO #TempCustomers\nFROM Customers;\n\nDELETE FROM Customers;\n\nINSERT INTO Customers\nSELECT *\nFROM #TempCustomers;\n\nDROP TABLE #TempCustomers;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u5c07\u552f\u4e00\u7684\u8a18\u9304\u9078\u64c7\u5230\u81e8\u6642\u8868\u4e2d\uff0c\u7136\u5f8c\u6e05\u7a7a\u539f\u59cb\u8868\uff0c\u6700\u5f8c\u5c07\u552f\u4e00\u8a18\u9304\u63d2\u5165\u56de\u53bb\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%aa%e9%80%a3%e6%8e%a5-LbYzTZZnps\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u81ea\u9023\u63a5<\/h3>\n<p>\u81ea\u9023\u63a5\u4e5f\u662f\u4e00\u7a2e\u6709\u6548\u7684\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELETE c1\nFROM Customers c1\nINNER JOIN Customers c2 \nON c1.Email = c2.Email\nWHERE c1.ID &gt; c2.ID;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u901a\u904e\u81ea\u9023\u63a5\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u4e26\u522a\u9664ID\u8f03\u5927\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u4fdd\u7559ID\u8f03\u5c0f\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LbYzTZZnps\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u67e5\u627e\u8207\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528GROUP BY\u3001CTE\u3001\u81e8\u6642\u8868\u6216\u81ea\u9023\u63a5\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2d\u67e5\u627e\u548c\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u6709\u6548\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\u548c\u67e5\u8a62\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-138453","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138453","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=138453"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138453\/revisions"}],"predecessor-version":[{"id":138454,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138453\/revisions\/138454"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}