{"id":180128,"date":"2024-11-09T07:38:16","date_gmt":"2024-11-08T23:38:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180128\/"},"modified":"2024-11-09T07:38:17","modified_gmt":"2024-11-08T23:38:17","slug":"%e4%b8%89%e6%8b%9b%e8%bc%95%e9%ac%86%e7%a2%ba%e5%ae%9aoracle%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e9%87%8d%e8%a4%87%e7%9a%84%e8%a8%98%e9%8c%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180128\/","title":{"rendered":"\u4e09\u62db\u8f15\u9b06\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u91cd\u8907\u7684\u8a18\u9304"},"content":{"rendered":"

\u4e09\u62db\u8f15\u9b06\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u91cd\u8907\u7684\u8a18\u9304<\/h1>\n

\u5728\u6578\u64da\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u7684\u8a18\u9304\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u751a\u81f3\u5f71\u97ff\u696d\u52d9\u6c7a\u7b56\u3002\u56e0\u6b64\uff0c\u78ba\u5b9a\u4e26\u8655\u7406\u9019\u4e9b\u91cd\u8907\u8a18\u9304\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u91cd\u8981\u4efb\u52d9\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e09\u7a2e\u7c21\u55ae\u7684\u65b9\u6cd5\u4f86\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u7dad\u8b77\u6578\u64da\u8cea\u91cf\u3002<\/p>\n

\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h2>\n

\u6700\u5e38\u898b\u7684\u78ba\u5b9a\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u662f\u4f7f\u7528SQL\u7684GROUP BY\u548cHAVING\u5b50\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u627e\u51fa\u5728\u7279\u5b9a\u5217\u4e2d\u51fa\u73fe\u591a\u6b21\u7684\u8a18\u9304\u3002<\/p>\n

SELECT column_name, COUNT(*)\nFROM table_name\nGROUP BY column_name\nHAVING COUNT(*) > 1;\n<\/code><\/pre>\n
\u5728\u9019\u6bb5SQL\u8a9e\u53e5\u4e2d\uff0ccolumn_name<\/code>\u662f\u6211\u5011\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u540d\uff0ctable_name<\/code>\u662f\u6211\u5011\u8981\u67e5\u8a62\u7684\u8868\u540d\u3002\u9019\u6bb5\u67e5\u8a62\u6703\u8fd4\u56de\u6240\u6709\u5728\u6307\u5b9a\u5217\u4e2d\u51fa\u73fe\u6b21\u6578\u5927\u65bc1\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u5e6b\u52a9\u6211\u5011\u8b58\u5225\u91cd\u8907\u7684\u6578\u64da\u3002<\/p>\n
\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h2>\n
\u53e6\u4e00\u7a2e\u78ba\u5b9a\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Oracle\u7684\u7a97\u53e3\u51fd\u6578ROW_NUMBER()<\/code>\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u53ef\u4ee5\u627e\u51fa\u91cd\u8907\u7684\u8a18\u9304\uff0c\u9084\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u9032\u4e00\u6b65\u8655\u7406\u9019\u4e9b\u8a18\u9304\uff0c\u4f8b\u5982\u522a\u9664\u591a\u9918\u7684\u91cd\u8907\u9805\u3002<\/p>\n
WITH RankedRecords AS (\n    SELECT column_name, \n           ROW_NUMBER() OVER (PARTITION BY column_name ORDER BY column_name) AS rn\n    FROM table_name\n)\nSELECT column_name\nFROM RankedRecords\nWHERE rn > 1;\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u4f7f\u7528ROW_NUMBER()<\/code>\u51fd\u6578\u70ba\u6bcf\u500b\u91cd\u8907\u7684\u8a18\u9304\u5206\u914d\u4e00\u500b\u5e8f\u865f\uff0c\u7136\u5f8c\u9078\u64c7\u5e8f\u865f\u5927\u65bc1\u7684\u8a18\u9304\uff0c\u9019\u6a23\u5c31\u80fd\u627e\u51fa\u6240\u6709\u91cd\u8907\u7684\u9805\u76ee\u3002<\/p>\n
\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528JOIN\u64cd\u4f5c<\/h2>\n
\u6700\u5f8c\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u78ba\u5b9a\u91cd\u8907\u7684\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u8b93\u6211\u5011\u66f4\u9748\u6d3b\u5730\u67e5\u8a62\u591a\u500b\u5217\u7684\u91cd\u8907\u60c5\u6cc1\u3002<\/p>\n
SELECT a.column_name\nFROM table_name a\nJOIN table_name b ON a.column_name = b.column_name\nWHERE a.rowid <> b.rowid;\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5c07\u8868table_name<\/code>\u8207\u81ea\u8eab\u9032\u884cJOIN\uff0c\u4e26\u901a\u904erowid<\/code>\u4f86\u6392\u9664\u76f8\u540c\u7684\u8a18\u9304\u3002\u9019\u6a23\u53ef\u4ee5\u627e\u51fa\u6240\u6709\u91cd\u8907\u7684\u9805\u76ee\uff0c\u4e26\u4e14\u53ef\u4ee5\u64f4\u5c55\u5230\u591a\u500b\u5217\u7684\u6bd4\u8f03\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528GROUP BY<\/code>\u548cHAVING<\/code>\u5b50\u53e5\u3001ROW_NUMBER()<\/code>\u51fd\u6578\u4ee5\u53caJOIN\u64cd\u4f5c\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u8b58\u5225\u548c\u8655\u7406\u91cd\u8907\u7684\u6578\u64da\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u9084\u80fd\u6539\u5584\u67e5\u8a62\u6027\u80fd\uff0c\u5f9e\u800c\u652f\u6301\u66f4\u6709\u6548\u7684\u696d\u52d9\u6c7a\u7b56\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684Oracle\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u5b89\u5168\u548c\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2\u4e09\u62db\u8f15\u9b06\u8b58\u5225Oracle\u6578\u64da\u5eab\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-180128","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180128","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=180128"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180128\/revisions"}],"predecessor-version":[{"id":180129,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180128\/revisions\/180129"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=180128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=180128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=180128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}