{"id":172191,"date":"2024-11-07T11:04:37","date_gmt":"2024-11-07T03:04:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172191\/"},"modified":"2024-11-07T11:04:38","modified_gmt":"2024-11-07T03:04:38","slug":"%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%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172191\/","title":{"rendered":"\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"%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%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95-XjnzfphFus\">\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u91cd\u8907\u8a18\u9304\u7684\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\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\u91cd\u8907\u8a18\u9304\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u91cd\u8981\u4efb\u52d9\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728Oracle\u6578\u64da\u5eab\u4e2d\u78ba\u5b9a\u91cd\u8907\u8a18\u9304\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684SQL\u67e5\u8a62\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%ef%bc%9f-XjnzfphFus\">\u4ec0\u9ebc\u662f\u91cd\u8907\u8a18\u9304\uff1f<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u662f\u6307\u5728\u6578\u64da\u5eab\u8868\u4e2d\u5b58\u5728\u591a\u689d\u76f8\u540c\u6216\u76f8\u4f3c\u7684\u8a18\u9304\u3002\u9019\u4e9b\u8a18\u9304\u53ef\u80fd\u5728\u67d0\u4e9b\u5b57\u6bb5\u4e0a\u5b8c\u5168\u76f8\u540c\uff0c\u6216\u8005\u5728\u67d0\u4e9b\u95dc\u9375\u5b57\u6bb5\u4e0a\u76f8\u540c\u3002\u91cd\u8907\u8a18\u9304\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u5197\u9918\uff0c\u589e\u52a0\u5b58\u5132\u6210\u672c\uff0c\u4e26\u4f7f\u6578\u64da\u5206\u6790\u8b8a\u5f97\u56f0\u96e3\u3002<\/p>\n<h2 id=\"%e7%a2%ba%e5%ae%9a%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95-XjnzfphFus\">\u78ba\u5b9a\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8group-by%e5%92%8chaving%e5%ad%90%e5%8f%a5-XjnzfphFus\">1. \u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h3>\n<p>\u6700\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528SQL\u7684GROUP BY\u548cHAVING\u5b50\u53e5\u4f86\u67e5\u627e\u91cd\u8907\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u627e\u51fa\u5728\u7279\u5b9a\u5b57\u6bb5\u4e0a\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<pre><code>SELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>column1<\/code>\u548c<code>column2<\/code>\u662f\u6211\u5011\u7528\u4f86\u6aa2\u67e5\u91cd\u8907\u7684\u5b57\u6bb5\u3002\u67e5\u8a62\u7d50\u679c\u5c07\u986f\u793a\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-XjnzfphFus\">2. \u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528Oracle\u7684<code>ROW_NUMBER()<\/code>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u9019\u500b\u5e8f\u865f\u4f86\u8b58\u5225\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<pre><code>WITH RankedRecords AS (\n    SELECT column1, column2, \n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY column1) AS rn\n    FROM your_table\n)\nSELECT column1, column2\nFROM RankedRecords\nWHERE rn &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u4f7f\u7528CTE\uff08\u516c\u5171\u8868\u8868\u9054\u5f0f\uff09\u4f86\u70ba\u6bcf\u7d44\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\u8a18\u9304\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8join%e8%aa%9e%e5%8f%a5-XjnzfphFus\">3. \u4f7f\u7528JOIN\u8a9e\u53e5<\/h3>\n<p>\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u67e5\u627e\u91cd\u8907\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u7528\u65bc\u9700\u8981\u6bd4\u8f03\u591a\u500b\u8868\u7684\u60c5\u6cc1\u3002<\/p>\n<pre><code>SELECT a.column1, a.column2\nFROM your_table a\nJOIN your_table b ON a.column1 = b.column1 AND a.column2 = b.column2\nWHERE a.rowid  b.rowid;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728<code>your_table<\/code>\u4e2d\u91cd\u8907\u7684\u8a18\u9304\uff0c\u901a\u904e\u6bd4\u8f03\u4e0d\u540c\u7684\u884cID\u4f86\u78ba\u4fdd\u4e0d\u6703\u8fd4\u56de\u540c\u4e00\u884c\u3002<\/p>\n<h2 id=\"%e8%99%95%e7%90%86%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-XjnzfphFus\">\u8655\u7406\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u78ba\u5b9a\u4e86\u91cd\u8907\u8a18\u9304\u5f8c\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u8655\u7406\u9019\u4e9b\u91cd\u8907\u7684\u6578\u64da\u3002\u5e38\u898b\u7684\u8655\u7406\u65b9\u6cd5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u522a\u9664\u91cd\u8907\u8a18\u9304\uff1a\u53ef\u4ee5\u4f7f\u7528DELETE\u8a9e\u53e5\u522a\u9664\u591a\u9918\u7684\u8a18\u9304\u3002<\/li>\n<li>\u5408\u4f75\u91cd\u8907\u8a18\u9304\uff1a\u5982\u679c\u9700\u8981\u4fdd\u7559\u67d0\u4e9b\u4fe1\u606f\uff0c\u53ef\u4ee5\u8003\u616e\u5408\u4f75\u91cd\u8907\u7684\u8a18\u9304\u3002<\/li>\n<li>\u6a19\u8a18\u91cd\u8907\u8a18\u9304\uff1a\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u4fdd\u7559\u6240\u6709\u8a18\u9304\uff0c\u4f46\u53ef\u4ee5\u901a\u904e\u6a19\u8a18\u4f86\u8b58\u5225\u91cd\u8907\u7684\u8a18\u9304\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XjnzfphFus\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\u78ba\u5b9a\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u7ba1\u7406\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528GROUP BY\u3001ROW_NUMBER()\u51fd\u6578\u548cJOIN\u8a9e\u53e5\u7b49\u65b9\u6cd5\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\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\u6578\u64da\u67e5\u8a62\u7684\u6027\u80fd\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\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u5e36\u4f86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u78ba\u5b9aOracle\u6578\u64da\u5eab\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\u8207\u67e5\u8a62\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u8207\u4e00\u81f4\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-172191","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172191","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=172191"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172191\/revisions"}],"predecessor-version":[{"id":172192,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172191\/revisions\/172192"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}