{"id":171591,"date":"2024-11-07T04:01:15","date_gmt":"2024-11-06T20:01:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171591\/"},"modified":"2024-11-07T04:01:16","modified_gmt":"2024-11-06T20:01:16","slug":"%e5%b7%a7%e7%94%a8sql%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171591\/","title":{"rendered":"\u5de7\u7528SQL\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u8a18\u9304"},"content":{"rendered":"<h1 id=\"%e5%b7%a7%e7%94%a8sql%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-smozvyQexB\">\u5de7\u7528SQL\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u9019\u4e0d\u50c5\u6703\u5f71\u97ff\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u6548\u7387\u7684\u964d\u4f4e\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u6709\u6548\u5730\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u6280\u5de7\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%a8%98%e9%8c%84%ef%bc%9f-smozvyQexB\">\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe\u91cd\u8907\u8a18\u9304\uff1f<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\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\uff0c\u4f8b\u5982\u5f9e\u4e0d\u540c\u4f86\u6e90\u5408\u4f75\u6578\u64da\u6642\u672a\u9032\u884c\u91cd\u8907\u6aa2\u67e5\u3002<\/li>\n<li>\u7528\u6236\u5728\u63d0\u4ea4\u6578\u64da\u6642\u4e0d\u5c0f\u5fc3\u91cd\u8907\u63d0\u4ea4\u3002<\/li>\n<li>\u7cfb\u7d71\u932f\u8aa4\u6216\u7a0b\u5e8f\u7f3a\u9677\u5c0e\u81f4\u6578\u64da\u91cd\u8907\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-smozvyQexB\">\u5982\u4f55\u8b58\u5225\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u8a18\u9304\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u54ea\u4e9b\u8a18\u9304\u662f\u91cd\u8907\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>column1<\/code> \u548c <code>column2<\/code> \u662f\u4f60\u60f3\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95-smozvyQexB\">\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u8a18\u9304\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u5b83\u5011\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%e7%94%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-smozvyQexB\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u4f7f\u7528\u516c\u7528\u8868\u9054\u5f0f\uff08CTE\uff09\u662f\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\u4f86\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 column1, column2 ORDER BY (SELECT NULL)) AS row_num\n    FROM your_table\n)\nDELETE FROM CTE WHERE row_num &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>ROW_NUMBER()<\/code> \u51fd\u6578\u70ba\u6bcf\u7d44\u91cd\u8907\u7684\u8a18\u9304\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\uff0c\u7136\u5f8c\u522a\u9664\u884c\u865f\u5927\u65bc1\u7684\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%e5%ad%90%e6%9f%a5%e8%a9%a2-smozvyQexB\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\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>\u9019\u500b\u67e5\u8a62\u5c07\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u6700\u5c0f\u7684ID\uff0c\u4e26\u522a\u9664\u5176\u4ed6\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8distinct%e5%92%8cinsert-into-smozvyQexB\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528DISTINCT\u548cINSERT INTO<\/h3>\n<p>\u5982\u679c\u4f60\u60f3\u4fdd\u7559\u539f\u59cb\u8868\u4e2d\u7684\u552f\u4e00\u8a18\u9304\uff0c\u53ef\u4ee5\u8003\u616e\u5275\u5efa\u4e00\u500b\u65b0\u8868\u4f86\u5b58\u5132\u9019\u4e9b\u552f\u4e00\u8a18\u9304\uff1a<\/p>\n<pre><code>CREATE TABLE new_table AS\nSELECT DISTINCT *\nFROM your_table;<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u4f60\u53ef\u4ee5\u522a\u9664\u539f\u59cb\u8868\u4e26\u5c07\u65b0\u8868\u91cd\u547d\u540d\u70ba\u539f\u59cb\u8868\u7684\u540d\u7a31\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-smozvyQexB\">\u7e3d\u7d50<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u7684\u7ba1\u7406\u662f\u6578\u64da\u5eab\u7dad\u8b77\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u901a\u904e\u4f7f\u7528\u4e0a\u8ff0SQL\u8a9e\u53e5\u548c\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u67e5\u8a62\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\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 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5de7\u7528SQL\u8a9e\u53e5\u6709\u6548\u522a\u9664\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u4fdd\u6301\u6578\u64da\u7684\u6574\u6f54\u8207\u6e96\u78ba\u6027\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-171591","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171591","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=171591"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171591\/revisions"}],"predecessor-version":[{"id":171592,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171591\/revisions\/171592"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}