{"id":188154,"date":"2024-11-11T20:15:24","date_gmt":"2024-11-11T12:15:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188154\/"},"modified":"2024-11-11T20:15:25","modified_gmt":"2024-11-11T12:15:25","slug":"%e5%9b%9b%e7%a8%aesql%e8%aa%9e%e5%8f%a5%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","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188154\/","title":{"rendered":"\u56db\u7a2eSQL\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"%e5%9b%9b%e7%a8%aesql%e8%aa%9e%e5%8f%a5%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-fmOVkVHiko\">\u56db\u7a2eSQL\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u5c0e\u5165\u6216\u5408\u4f75\u904e\u7a0b\u4e2d\u3002\u9019\u4e9b\u91cd\u8907\u7684\u6578\u64da\u4e0d\u50c5\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u6548\u7387\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u5206\u6790\u7684\u932f\u8aa4\u3002\u56e0\u6b64\uff0c\u5b78\u6703\u5982\u4f55\u6709\u6548\u5730\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u56db\u7a2e\u5e38\u7528\u7684SQL\u8a9e\u53e5\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-fmOVkVHiko\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h2>\n<p>\u5728SQL Server\u548c\u5176\u4ed6\u652f\u6301\u7a97\u53e3\u51fd\u6578\u7684\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>ROW_NUMBER()<\/code>\u51fd\u6578\u4f86\u6a19\u8a18\u6bcf\u4e00\u884c\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u6839\u64da\u9019\u500b\u5e8f\u865f\u4f86\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<pre><code>WITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS rn\n    FROM your_table\n)\nDELETE FROM CTE WHERE rn &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>column1<\/code>\u548c<code>column2<\/code>\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5217\u3002\u9019\u6bb5\u4ee3\u78bc\u6703\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u8a18\u9304\u3002<\/p>\n<h2 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-fmOVkVHiko\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h2>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u5b50\u53e5\u4f86\u627e\u51fa\u91cd\u8907\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u522a\u9664\u5b83\u5011\u3002<\/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\u6bb5\u4ee3\u78bc\u6703\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d<code>id<\/code>\u6700\u5c0f\u7684\u90a3\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u4ed6\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8distinct%e5%92%8cinsert-into-fmOVkVHiko\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528DISTINCT\u548cINSERT INTO<\/h2>\n<p>\u5982\u679c\u4f60\u5e0c\u671b\u4fdd\u7559\u4e00\u4efd\u4e0d\u5305\u542b\u91cd\u8907\u8a18\u9304\u7684\u65b0\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528<code>INSERT INTO<\/code>\u548c<code>DISTINCT<\/code>\u4f86\u5be6\u73fe\u3002<\/p>\n<pre><code>CREATE TABLE new_table AS\nSELECT DISTINCT *\nFROM your_table;<\/code><\/pre>\n<p>\u9019\u6a23\u6703\u5275\u5efa\u4e00\u500b\u65b0\u8868<code>new_table<\/code>\uff0c\u5176\u4e2d\u53ea\u5305\u542b\u4e0d\u91cd\u8907\u7684\u8a18\u9304\u3002\u7136\u5f8c\uff0c\u4f60\u53ef\u4ee5\u9078\u64c7\u522a\u9664\u539f\u59cb\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u4e26\u5c07\u65b0\u8868\u91cd\u547d\u540d\u70ba\u539f\u59cb\u8868\u7684\u540d\u7a31\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e5%9b%9b%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%aa%e9%80%a3%e6%8e%a5-fmOVkVHiko\">\u65b9\u6cd5\u56db\uff1a\u4f7f\u7528\u81ea\u9023\u63a5<\/h2>\n<p>\u81ea\u9023\u63a5\u662f\u4e00\u7a2e\u901a\u904e\u5c07\u8868\u8207\u81ea\u8eab\u9032\u884c\u9023\u63a5\u4f86\u67e5\u627e\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u3002<\/p>\n<pre><code>DELETE a\nFROM your_table a\nINNER JOIN your_table b\nON a.column1 = b.column1 AND a.column2 = b.column2\nWHERE a.id &gt; b.id;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u6703\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ea\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d<code>id<\/code>\u6700\u5c0f\u7684\u90a3\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fmOVkVHiko\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u78ba\u4fdd\u6578\u64da\u8cea\u91cf\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u672c\u6587\u4ecb\u7d39\u4e86\u56db\u7a2e\u5e38\u7528\u7684SQL\u8a9e\u53e5\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u5305\u62ec\u4f7f\u7528<code>ROW_NUMBER()<\/code>\u51fd\u6578\u3001<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u5b50\u53e5\u3001<code>DISTINCT<\/code>\u548c\u81ea\u9023\u63a5\u7b49\u65b9\u6cd5\u3002\u9019\u4e9b\u65b9\u6cd5\u5404\u6709\u512a\u7f3a\u9ede\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u6578\u64da\u5eab\u74b0\u5883\u548c\u9700\u6c42\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u56db\u7a2e\u6709\u6548\u7684SQL\u8a9e\u53e5\u65b9\u6cd5\uff0c\u8f15\u9b06\u522a\u9664\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\u8207\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-188154","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188154","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=188154"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188154\/revisions"}],"predecessor-version":[{"id":188155,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188154\/revisions\/188155"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}