{"id":139045,"date":"2024-10-31T17:47:33","date_gmt":"2024-10-31T09:47:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139045\/"},"modified":"2024-10-31T17:47:34","modified_gmt":"2024-10-31T09:47:34","slug":"sql-server%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%ad%a3%e7%a2%ba%e6%93%8d%e4%bd%9c2%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139045\/","title":{"rendered":"SQL Server\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u6b63\u78ba\u64cd\u4f5c2\u65b9\u6848"},"content":{"rendered":"<h1 id=\"sql-server%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%ad%a3%e7%a2%ba%e6%93%8d%e4%bd%9c2%e6%96%b9%e6%a1%88-sGUGAamBkr\">SQL Server\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u6b63\u78ba\u64cd\u4f5c2\u65b9\u6848<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\u548c\u67e5\u8a62\u6548\u7387\u7684\u964d\u4f4e\u3002\u56e0\u6b64\uff0c\u53ca\u6642\u522a\u9664\u91cd\u8907\u6578\u64da\u662f\u7dad\u8b77\u6578\u64da\u5eab\u5065\u5eb7\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5169\u7a2e\u5728SQL Server\u4e2d\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u6b63\u78ba\u64cd\u4f5c\u65b9\u6848\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%a1%88%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89%e5%92%8crow_number-sGUGAamBkr\">\u65b9\u6848\u4e00\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u9054\u5f0f\uff09\u548cROW_NUMBER()<\/h2>\n<p>\u7b2c\u4e00\u7a2e\u65b9\u6848\u662f\u5229\u7528CTE\u548cROW_NUMBER()\u51fd\u6578\u4f86\u6a19\u8b58\u91cd\u8907\u7684\u6578\u64da\u884c\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5b83\u80fd\u5920\u9748\u6d3b\u5730\u9078\u64c7\u4fdd\u7559\u54ea\u4e00\u884c\u6578\u64da\uff0c\u4e26\u4e14\u64cd\u4f5c\u7c21\u55ae\u660e\u77ad\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%ef%bc%9a-sGUGAamBkr\">\u6b65\u9a5f\uff1a<\/h3>\n<ol>\n<li>\u9996\u5148\uff0c\u4f7f\u7528CTE\u4f86\u9078\u64c7\u9700\u8981\u6aa2\u67e5\u7684\u8868\u683c\uff0c\u4e26\u4f7f\u7528ROW_NUMBER()\u51fd\u6578\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\u3002<\/li>\n<li>\u7136\u5f8c\uff0c\u6839\u64da\u67d0\u4e9b\u5217\u7684\u503c\u4f86\u5206\u7d44\uff0c\u4e26\u70ba\u6bcf\u7d44\u4e2d\u7684\u884c\u5206\u914d\u5e8f\u865f\u3002<\/li>\n<li>\u6700\u5f8c\uff0c\u522a\u9664\u5e8f\u865f\u5927\u65bc1\u7684\u884c\uff0c\u9019\u6a23\u5c31\u80fd\u4fdd\u7559\u6bcf\u7d44\u4e2d\u7684\u7b2c\u4e00\u884c\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc%ef%bc%9a-sGUGAamBkr\">\u793a\u4f8b\u4ee3\u78bc\uff1a<\/h3>\n<pre><code>\nWITH CTE AS (\n    SELECT \n        *,\n        ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS row_num\n    FROM \n        your_table\n)\nDELETE FROM CTE WHERE row_num &gt; 1;\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>column1<\/code>\u548c<code>column2<\/code>\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5217\u3002\u7528\u6236\u53ef\u4ee5\u6839\u64da\u5be6\u969b\u9700\u6c42\u8abf\u6574\u9019\u4e9b\u5217\u7684\u9078\u64c7\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%a1%88%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8group-by%e5%92%8chaving%e5%ad%90%e5%8f%a5-sGUGAamBkr\">\u65b9\u6848\u4e8c\uff1a\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h2>\n<p>\u7b2c\u4e8c\u7a2e\u65b9\u6848\u662f\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5\u4f86\u8b58\u5225\u91cd\u8907\u6578\u64da\uff0c\u7136\u5f8c\u522a\u9664\u9019\u4e9b\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u9700\u8981\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u4f86\u7be9\u9078\u91cd\u8907\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%ef%bc%9a-sGUGAamBkr\">\u6b65\u9a5f\uff1a<\/h3>\n<ol>\n<li>\u9996\u5148\uff0c\u4f7f\u7528GROUP BY\u5b50\u53e5\u4f86\u5206\u7d44\u6578\u64da\uff0c\u4e26\u4f7f\u7528HAVING\u5b50\u53e5\u4f86\u7be9\u9078\u51fa\u91cd\u8907\u7684\u884c\u3002<\/li>\n<li>\u7136\u5f8c\uff0c\u6839\u64da\u7be9\u9078\u51fa\u7684\u91cd\u8907\u884c\u4f86\u522a\u9664\u6578\u64da\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc%ef%bc%9a-sGUGAamBkr\">\u793a\u4f8b\u4ee3\u78bc\uff1a<\/h3>\n<pre><code>\nDELETE FROM your_table\nWHERE ID NOT IN (\n    SELECT MIN(ID)\n    FROM your_table\n    GROUP BY column1, column2\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>ID<\/code>\u662f\u8868\u4e2d\u7684\u4e3b\u9375\uff0c<code>column1<\/code>\u548c<code>column2<\/code>\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5217\u3002\u9019\u6a23\u7684\u64cd\u4f5c\u5c07\u4fdd\u7559\u6bcf\u7d44\u4e2d\u7684\u6700\u5c0fID\uff0c\u4e26\u522a\u9664\u5176\u4ed6\u91cd\u8907\u7684\u884c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-sGUGAamBkr\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u64cd\u4f5c\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u5f0f\u5be6\u73fe\uff0c\u672c\u6587\u4ecb\u7d39\u7684\u5169\u7a2e\u65b9\u6848\u5206\u5225\u5229\u7528\u4e86CTE\u548cGROUP BY\u7684\u7279\u6027\u3002\u6839\u64da\u5177\u9ad4\u7684\u9700\u6c42\u548c\u6578\u64da\u7d50\u69cb\uff0c\u7528\u6236\u53ef\u4ee5\u9078\u64c7\u6700\u9069\u5408\u7684\u65b9\u6848\u4f86\u9032\u884c\u64cd\u4f5c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code>VPS<\/code>\u3001<code>\u9999\u6e2fVPS<\/code>\u6216\u5176\u4ed6<code>\u4e91\u670d\u52a1\u5668<\/code>\u7684\u9700\u6c42\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a> \u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL Server\u4e2d\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u5169\u7a2e\u6b63\u78ba\u64cd\u4f5c\u65b9\u6848\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-139045","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139045","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=139045"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139045\/revisions"}],"predecessor-version":[{"id":139046,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139045\/revisions\/139046"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}