{"id":95330,"date":"2024-10-20T00:09:19","date_gmt":"2024-10-19T16:09:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95330\/"},"modified":"2024-10-20T00:09:19","modified_gmt":"2024-10-19T16:09:19","slug":"oracle%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95330\/","title":{"rendered":"Oracle\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u5be6\u73fe\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"oracle%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e6%b3%95-PeQkcTjwND\">Oracle\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u5be6\u73fe\u65b9\u6cd5<\/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\u548c\u67e5\u8a62\u6548\u7387\u7684\u964d\u4f4e\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u5e38\u898b\u7684\u5be6\u73fe\u65b9\u6cd5\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8rownum-PeQkcTjwND\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROWNUM<\/h2>\n<p>\u4e00\u7a2e\u7c21\u55ae\u7684\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u662f\u5229\u7528ROWNUM\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u7528\u65bc\u5728\u4e00\u500b\u8868\u4e2d\u6709\u660e\u78ba\u7684\u91cd\u8907\u8a18\u9304\u6642\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELETE FROM your_table\nWHERE ROWID NOT IN (\n    SELECT MIN(ROWID)\n    FROM your_table\n    GROUP BY column1, column2, column3\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>your_table<\/code>\u662f\u9700\u8981\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u8868\uff0c\u800c<code>column1<\/code>\u3001<code>column2<\/code>\u548c<code>column3<\/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%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-PeQkcTjwND\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09<\/h2>\n<p>\u53e6\u4e00\u7a2e\u6709\u6548\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u7279\u5225\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528CTE\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH duplicates AS (\n    SELECT column1, column2, COUNT(*) AS cnt\n    FROM your_table\n    GROUP BY column1, column2\n    HAVING COUNT(*) &gt; 1\n)\nDELETE FROM your_table\nWHERE (column1, column2) IN (\n    SELECT column1, column2\n    FROM duplicates\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cCTE\u9996\u5148\u627e\u51fa\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u5728\u4e3b\u67e5\u8a62\u4e2d\u522a\u9664\u9019\u4e9b\u91cd\u8907\u7684\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5b83\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n<h2 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-PeQkcTjwND\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u81ea\u9023\u63a5<\/h2>\n<p>\u81ea\u9023\u63a5\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u6280\u8853\uff0c\u53ef\u4ee5\u7528\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/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.ROWID &gt; b.ROWID;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u8868<code>your_table<\/code>\u88ab\u81ea\u9023\u63a5\uff0c\u4e26\u6839\u64da<code>column1<\/code>\u548c<code>column2<\/code>\u9032\u884c\u5339\u914d\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u53ea\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e5%9b%9b%ef%bc%9a%e4%bd%bf%e7%94%a8merge%e8%aa%9e%e5%8f%a5-PeQkcTjwND\">\u65b9\u6cd5\u56db\uff1a\u4f7f\u7528MERGE\u8a9e\u53e5<\/h2>\n<p>MERGE\u8a9e\u53e5\u4e5f\u53ef\u4ee5\u7528\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u7528\u65bc\u9700\u8981\u5408\u4f75\u6578\u64da\u7684\u60c5\u6cc1\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>MERGE INTO your_table a\nUSING (\n    SELECT MIN(ROWID) AS min_rowid\n    FROM your_table\n    GROUP BY column1, column2\n) b\nON (a.ROWID = b.min_rowid)\nWHEN NOT MATCHED THEN\n    DELETE;<\/code><\/pre>\n<p>\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\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5b83\u7684\u9748\u6d3b\u6027\uff0c\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PeQkcTjwND\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5f9e\u4f7f\u7528ROWNUM\u5230CTE\u3001\u81ea\u9023\u63a5\u548cMERGE\u8a9e\u53e5\uff0c\u6bcf\u7a2e\u65b9\u6cd5\u90fd\u6709\u5176\u7279\u5b9a\u7684\u61c9\u7528\u5834\u666f\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6578\u64da\u7684\u6574\u9ad4\u8cea\u91cf\u548c\u67e5\u8a62\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\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>\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a> \u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u4e2d\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u6709\u6548\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\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-95330","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95330","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=95330"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95330\/revisions"}],"predecessor-version":[{"id":95331,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95330\/revisions\/95331"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}