{"id":95332,"date":"2024-10-20T00:10:20","date_gmt":"2024-10-19T16:10:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95332\/"},"modified":"2024-10-20T00:10:21","modified_gmt":"2024-10-19T16:10:21","slug":"oracle%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95332\/","title":{"rendered":"Oracle\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u5be6\u969b\u64cd\u4f5c\u65b9\u6848"},"content":{"rendered":"

Oracle\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u5be6\u969b\u64cd\u4f5c\u65b9\u6848<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u7684\u5b58\u5728\u6703\u5f71\u97ff\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u6709\u6548\u7684\u64cd\u4f5c\u65b9\u6848\uff0c\u5e6b\u52a9\u7528\u6236\u5728Oracle\u6578\u64da\u5eab\u4e2d\u6e05\u7406\u91cd\u8907\u6578\u64da\u3002<\/p>\n

\u91cd\u8907\u6578\u64da\u7684\u8b58\u5225<\/h2>\n

\u5728\u522a\u9664\u91cd\u8907\u6578\u64da\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u54ea\u4e9b\u6578\u64da\u662f\u91cd\u8907\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff1a<\/p>\n

\nSELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2\nHAVING COUNT(*) > 1;\n<\/code><\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c`column1`\u548c`column2`\u662f\u9700\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
\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5<\/h2>\n
\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u6578\u64da\uff0c\u63a5\u4e0b\u4f86\u5c31\u53ef\u4ee5\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u5b83\u5011\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u522a\u9664\u65b9\u6cd5\uff1a<\/p>\n
\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROWID\u522a\u9664<\/h3>\n
Oracle\u6578\u64da\u5eab\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u6709\u4e00\u500b\u552f\u4e00\u7684ROWID\uff0c\u53ef\u4ee5\u5229\u7528\u9019\u4e00\u7279\u6027\u4f86\u522a\u9664\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
\nDELETE FROM your_table\nWHERE ROWID NOT IN (\n    SELECT MIN(ROWID)\n    FROM your_table\n    GROUP BY column1, column2\n);\n<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u91cd\u8907\u8a18\u9304\u3002<\/p>\n
\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09<\/h3>\n
\u4f7f\u7528CTE\u53ef\u4ee5\u4f7f\u67e5\u8a62\u66f4\u52a0\u6e05\u6670\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528CTE\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n
\nWITH duplicates AS (\n    SELECT ROWID AS rid, \n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY ROWID) AS rnum\n    FROM your_table\n)\nDELETE FROM duplicates\nWHERE rnum > 1;\n<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u70ba\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u5206\u914d\u4e00\u500b\u5e8f\u865f\uff0c\u4e26\u522a\u9664\u5e8f\u865f\u5927\u65bc1\u7684\u8a18\u9304\u3002<\/p>\n
\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528TEMPORARY TABLE<\/h3>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u5c07\u552f\u4e00\u8a18\u9304\u63d2\u5165\u5230\u4e00\u500b\u81e8\u6642\u8868\u4e2d\uff0c\u7136\u5f8c\u518d\u5c07\u5176\u63d2\u5165\u56de\u539f\u8868\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u4e0d\u6703\u4e1f\u5931\u4efb\u4f55\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n
\nCREATE TABLE temp_table AS\nSELECT DISTINCT *\nFROM your_table;\n\nDELETE FROM your_table;\n\nINSERT INTO your_table\nSELECT * FROM temp_table;\n\nDROP TABLE temp_table;\n<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u5275\u5efa\u4e00\u500b\u81e8\u6642\u8868\uff0c\u7136\u5f8c\u5c07\u552f\u4e00\u8a18\u9304\u63d2\u5165\u56de\u539f\u8868\uff0c\u6700\u5f8c\u522a\u9664\u81e8\u6642\u8868\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u522a\u9664\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u91cd\u8981\u7684\u7dad\u8b77\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528ROWID\u3001CTE\u6216\u81e8\u6642\u8868\u7b49\u65b9\u6cd5\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u6e05\u7406\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\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\u9999\u6e2fVPS<\/a><\/code>\u6216\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3Oracle\u522a\u9664\u91cd\u8907\u6578\u64da\u7684\u5be6\u969b\u64cd\u4f5c\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\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-95332","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95332","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=95332"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95332\/revisions"}],"predecessor-version":[{"id":95333,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95332\/revisions\/95333"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}