{"id":199936,"date":"2025-05-06T08:23:51","date_gmt":"2025-05-06T00:23:51","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199936\/"},"modified":"2025-05-06T08:23:51","modified_gmt":"2025-05-06T00:23:51","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8oracle%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e5%8e%bb%e9%99%a4%e9%87%8d%e5%a4%8d%e6%95%b0%e6%8d%ae%e5%b9%b6%e4%bf%9d%e7%95%99%e5%94%af%e4%b8%80%e8%ae%b0%e5%bd%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199936\/","title":{"rendered":"\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u53bb\u9664\u91cd\u590d\u6570\u636e\u5e76\u4fdd\u7559\u552f\u4e00\u8bb0\u5f55\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u53bb\u9664\u91cd\u590d\u6570\u636e\u5e76\u4fdd\u7559\u552f\u4e00\u8bb0\u5f55\uff1f<\/h1>\n

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n

\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u5904\u7406\u91cd\u590d\u6570\u636e\u4ec5\u4fdd\u7559\u4e00\u6761\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002\u8fd9\u79cd\u60c5\u51b5\u901a\u5e38\u53d1\u751f\u5728\u6570\u636e\u8868\u4e2d\u5b58\u5728\u91cd\u590d\u6570\u636e\uff0c\u4f46\u6211\u4eec\u53ea\u9700\u8981\u4fdd\u7559\u5176\u4e2d\u4e00\u6761\uff0c\u800c\u53bb\u9664\u5176\u4f59\u91cd\u590d\u6570\u636e\u3002Oracle\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\uff0c\u5305\u62ec\u4f7f\u7528ROWID\u548cROW_NUMBER\u51fd\u6570\u7b49\u65b9\u6cd5\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5904\u7406\u91cd\u590d\u6570\u636e\u4ec5\u53d6\u4e00\u6761\uff0c\u540c\u65f6\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROWID<\/h3>\n

\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u6bcf\u4e00\u884c\u6570\u636e\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684ROWID\u6807\u8bc6\u7b26\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u7279\u6027\u6765\u5220\u9664\u91cd\u590d\u6570\u636e\uff0c\u4ec5\u4fdd\u7559\u4e00\u6761\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8bSQL\u8bed\u53e5\uff1a<\/p>\n

DELETE FROM your_table\nWHERE ROWID NOT IN\n(SELECT MIN(ROWID)\nFROM your_table\nGROUP BY column1, column2, ...);<\/pre>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cyour_table<\/code>\u662f\u4f60\u8981\u5904\u7406\u7684\u6570\u636e\u8868\uff0ccolumn1, column2, ...<\/code>\u662f\u7528\u6765\u5224\u65ad\u91cd\u590d\u6570\u636e\u7684\u5b57\u6bb5\u3002\u901a\u8fc7GROUP BY\u5b50\u53e5\u5bf9\u8fd9\u4e9b\u5b57\u6bb5\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u901a\u8fc7MIN\u51fd\u6570\u9009\u62e9\u6bcf\u7ec4\u4e2d\u7684\u6700\u5c0fROWID\uff0c\u4ece\u800c\u4fdd\u7559\u4e00\u6761\u6570\u636e\uff0c\u5176\u4f59\u91cd\u590d\u6570\u636e\u5c06\u88ab\u5220\u9664\u3002<\/p>\n
\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528ROW_NUMBER\u51fd\u6570<\/h3>\n
\u53e6\u4e00\u79cd\u5904\u7406\u91cd\u590d\u6570\u636e\u7684\u65b9\u6cd5\u662f\u5229\u7528ROW_NUMBER\u51fd\u6570\uff0c\u901a\u8fc7\u7ed9\u91cd\u590d\u6570\u636e\u8fdb\u884c\u7f16\u53f7\uff0c\u7136\u540e\u5220\u9664\u7f16\u53f7\u5927\u4e8e1\u7684\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8bSQL\u8bed\u53e5\uff1a<\/p>\n
DELETE FROM\n(SELECT column1, column2, ..., ROW_NUMBER() OVER (PARTITION BY column1, column2, ... ORDER BY column1) AS rn\nFROM your_table)\nWHERE rn > 1;<\/pre>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7ROW_NUMBER\u51fd\u6570\u5bf9\u91cd\u590d\u6570\u636e\u8fdb\u884c\u7f16\u53f7\uff0c\u540c\u65f6\u901a\u8fc7PARTITION BY\u5b50\u53e5\u6307\u5b9a\u5206\u7ec4\u5b57\u6bb5\uff0cORDER BY\u5b50\u53e5\u6307\u5b9a\u6392\u5e8f\u5b57\u6bb5\u3002\u6700\u540e\uff0c\u5220\u9664\u7f16\u53f7\u5927\u4e8e1\u7684\u6570\u636e\uff0c\u4fdd\u7559\u7f16\u53f7\u4e3a1\u7684\u6570\u636e\u3002<\/p>\n
\u4ee5\u4e0a\u662f\u4e24\u79cd\u5e38\u89c1\u7684\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5904\u7406\u91cd\u590d\u6570\u636e\u4ec5\u53d6\u4e00\u6761\u7684\u65b9\u6cd5\u3002\u6839\u636e\u5177\u4f53\u7684\u60c5\u51b5\u548c\u9700\u6c42\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u5904\u7406\u91cd\u590d\u6570\u636e\uff0c\u4fdd\u6301\u6570\u636e\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u53bb\u9664\u91cd\u590d\u6570\u636e\u5e76\u4fdd\u7559\u552f\u4e00\u8bb0\u5f55\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u53bb\u9664\u91cd...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199936","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199936","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199936"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199936\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}