{"id":191994,"date":"2024-11-12T17:33:19","date_gmt":"2024-11-12T09:33:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/191994\/"},"modified":"2024-11-12T17:33:21","modified_gmt":"2024-11-12T09:33:21","slug":"%e8%a9%b3%e8%a7%a3%e5%a6%82%e4%bd%95%e5%88%aa%e9%99%a4sql-server%e8%a1%a8%e4%b8%ad%e7%9a%84%e9%87%8d%e8%a4%87%e8%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/191994\/","title":{"rendered":"\u8a73\u89e3\u5982\u4f55\u522a\u9664SQL Server\u8868\u4e2d\u7684\u91cd\u8907\u884c"},"content":{"rendered":"<h1 id=\"%e8%a9%b3%e8%a7%a3%e5%a6%82%e4%bd%95%e5%88%aa%e9%99%a4sql-server%e8%a1%a8%e4%b8%ad%e7%9a%84%e9%87%8d%e8%a4%87%e8%a1%8c-fmQRgONGyU\">\u8a73\u89e3\u5982\u4f55\u522a\u9664SQL Server\u8868\u4e2d\u7684\u91cd\u8907\u884c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u7279\u5225\u662f\u5728SQL Server\u4e2d\u3002\u91cd\u8907\u884c\u4e0d\u50c5\u6703\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u7d50\u679c\u7684\u4e0d\u6e96\u78ba\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u522a\u9664\u9019\u4e9b\u91cd\u8907\u884c\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5e7e\u7a2e\u522a\u9664SQL Server\u8868\u4e2d\u91cd\u8907\u884c\u7684\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e6%9c%83%e5%87%ba%e7%8f%be%e9%87%8d%e8%a4%87%e8%a1%8c-fmQRgONGyU\">\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe\u91cd\u8907\u884c<\/h2>\n<p>\u91cd\u8907\u884c\u7684\u51fa\u73fe\u901a\u5e38\u662f\u7531\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u5c0e\u5165\u904e\u7a0b\u4e2d\u7684\u932f\u8aa4\u3002<\/li>\n<li>\u591a\u500b\u7528\u6236\u540c\u6642\u63d2\u5165\u6578\u64da\u6642\u672a\u9032\u884c\u9069\u7576\u7684\u6aa2\u67e5\u3002<\/li>\n<li>\u7f3a\u4e4f\u552f\u4e00\u7d04\u675f\u6216\u4e3b\u9375\u7684\u8a2d\u7f6e\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a1%8c%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-fmQRgONGyU\">\u522a\u9664\u91cd\u8907\u884c\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u6709\u5e7e\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u522a\u9664\u91cd\u8907\u884c\u3002\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%e5%85%b1%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-fmQRgONGyU\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528CTE\uff08\u516c\u5171\u8868\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u4f7f\u7528CTE\u662f\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u884c\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>WITH 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;<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c`column1`\u548c`column2`\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5217\u3002`ROW_NUMBER()`\u51fd\u6578\u70ba\u6bcf\u7d44\u91cd\u8907\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\uff0c\u7136\u5f8c\u522a\u9664\u884c\u865f\u5927\u65bc1\u7684\u884c\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8group-by%e5%92%8chaving%e5%ad%90%e5%8f%a5-fmQRgONGyU\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528`GROUP BY`\u548c`HAVING`\u5b50\u53e5\u4f86\u8b58\u5225\u91cd\u8907\u884c\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>DELETE FROM your_table\nWHERE ID NOT IN (\n    SELECT MIN(ID)\n    FROM your_table\n    GROUP BY column1, column2\n);<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c`ID`\u662f\u8868\u4e2d\u7684\u4e3b\u9375\u3002\u9019\u6bb5\u4ee3\u78bc\u5c07\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u884c\u4e2d\u7684\u6700\u5c0fID\uff0c\u4e26\u522a\u9664\u5176\u4ed6\u884c\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8distinct%e5%89%b5%e5%bb%ba%e6%96%b0%e8%a1%a8-fmQRgONGyU\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528DISTINCT\u5275\u5efa\u65b0\u8868<\/h3>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u4fdd\u7559\u539f\u59cb\u8868\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u8003\u616e\u5275\u5efa\u4e00\u500b\u65b0\u8868\uff0c\u7136\u5f8c\u5c07\u552f\u4e00\u7684\u6578\u64da\u63d2\u5165\u5230\u65b0\u8868\u4e2d\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>SELECT DISTINCT *\nINTO new_table\nFROM your_table;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u60a8\u5c07\u64c1\u6709\u4e00\u500b\u4e0d\u5305\u542b\u91cd\u8907\u884c\u7684\u65b0\u8868\u3002\u7136\u5f8c\uff0c\u60a8\u53ef\u4ee5\u9078\u64c7\u522a\u9664\u539f\u59cb\u8868\u6216\u91cd\u547d\u540d\u65b0\u8868\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-fmQRgONGyU\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u884c\u4e4b\u524d\uff0c\u5efa\u8b70\u60a8\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u91cd\u8981\u4fe1\u606f\u3002\u6b64\u5916\uff0c\u78ba\u4fdd\u5728\u522a\u9664\u64cd\u4f5c\u5f8c\u6aa2\u67e5\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fmQRgONGyU\">\u7e3d\u7d50<\/h2>\n<p>\u522a\u9664SQL Server\u8868\u4e2d\u7684\u91cd\u8907\u884c\u662f\u4e00\u9805\u91cd\u8981\u7684\u6578\u64da\u7ba1\u7406\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528CTE\u3001GROUP BY\u548cDISTINCT\u7b49\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u6e05\u7406\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u6578\u64da\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u9084\u80fd\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u6216\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u522a\u9664SQL Server\u8868\u4e2d\u7684\u91cd\u8907\u884c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\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-191994","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191994","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=191994"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191994\/revisions"}],"predecessor-version":[{"id":191995,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191994\/revisions\/191995"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=191994"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=191994"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=191994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}