{"id":174673,"date":"2024-11-07T22:47:22","date_gmt":"2024-11-07T14:47:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/174673\/"},"modified":"2024-11-07T22:47:23","modified_gmt":"2024-11-07T14:47:23","slug":"%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e9%80%b2%e8%a1%8corcale%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%bb%e9%87%8d%e6%93%8d%e4%bd%9c%ef%bc%9f-orcal%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%bb%e9%87%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/174673\/","title":{"rendered":"\u5982\u4f55\u5feb\u901f\u9032\u884cOrcale\u6578\u64da\u5eab\u53bb\u91cd\u64cd\u4f5c\uff1f (orcal\u6578\u64da\u5eab\u53bb\u91cd)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e9%80%b2%e8%a1%8coracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%bb%e9%87%8d%e6%93%8d%e4%bd%9c%ef%bc%9f-NjHbeFBAmx\">\u5982\u4f55\u5feb\u901f\u9032\u884cOracle\u6578\u64da\u5eab\u53bb\u91cd\u64cd\u4f5c\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u53bb\u91cd\u662f\u4e00\u500b\u91cd\u8981\u7684\u904e\u7a0b\uff0c\u7279\u5225\u662f\u5728Oracle\u6578\u64da\u5eab\u4e2d\u3002\u53bb\u91cd\u64cd\u4f5c\u4e0d\u50c5\u53ef\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Oracle\u6578\u64da\u5eab\u4e2d\u5feb\u901f\u9032\u884c\u53bb\u91cd\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%8e%bb%e9%87%8d%ef%bc%9f-NjHbeFBAmx\">\u4ec0\u9ebc\u662f\u6578\u64da\u53bb\u91cd\uff1f<\/h2>\n<p>\u6578\u64da\u53bb\u91cd\u662f\u6307\u8b58\u5225\u4e26\u522a\u9664\u91cd\u8907\u7684\u6578\u64da\u8a18\u9304\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u548c\u5b8c\u6574\u6027\u3002\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u9019\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528SQL\u67e5\u8a62\u4f86\u67e5\u627e\u548c\u522a\u9664\u91cd\u8907\u7684\u884c\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%8e%bb%e9%87%8d%ef%bc%9f-NjHbeFBAmx\">\u70ba\u4ec0\u9ebc\u9700\u8981\u53bb\u91cd\uff1f<\/h2>\n<ul>\n<li><strong>\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff1a<\/strong>\u91cd\u8907\u7684\u6578\u64da\u6703\u4f54\u7528\u4e0d\u5fc5\u8981\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u53bb\u91cd\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u5927\u5c0f\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u91cd\u8907\u6578\u64da\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u6548\u7387\uff0c\u53bb\u91cd\u5f8c\u7684\u6578\u64da\u5eab\u80fd\u5920\u66f4\u5feb\u5730\u8fd4\u56de\u67e5\u8a62\u7d50\u679c\u3002<\/li>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u53bb\u91cd\u6709\u52a9\u65bc\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\uff0c\u907f\u514d\u56e0\u91cd\u8907\u6578\u64da\u800c\u5c0e\u81f4\u7684\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%bb%e9%87%8d%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-NjHbeFBAmx\">Oracle\u6578\u64da\u5eab\u53bb\u91cd\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u53bb\u91cd\u64cd\u4f5c\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-NjHbeFBAmx\">1. \u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h3>\n<p>ROW_NUMBER()\u51fd\u6578\u53ef\u4ee5\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u6839\u64da\u9019\u500b\u5e8f\u865f\u4f86\u522a\u9664\u91cd\u8907\u7684\u884c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nDELETE FROM your_table\nWHERE rowid NOT IN (\n    SELECT MIN(rowid)\n    FROM your_table\n    GROUP BY column1, column2, column3\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>your_table<\/code>\u662f\u9700\u8981\u53bb\u91cd\u7684\u8868\uff0c<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\u5c07\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u91cd\u8907\u884c\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8group-by%e8%aa%9e%e5%8f%a5-NjHbeFBAmx\">2. \u4f7f\u7528GROUP BY\u8a9e\u53e5<\/h3>\n<p>\u53e6\u4e00\u7a2e\u5e38\u898b\u7684\u53bb\u91cd\u65b9\u6cd5\u662f\u4f7f\u7528GROUP BY\u8a9e\u53e5\u4f86\u805a\u5408\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u9700\u8981\u4fdd\u7559\u67d0\u4e9b\u805a\u5408\u7d50\u679c\u7684\u60c5\u6cc1\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u6bcf\u7d44\u552f\u4e00\u7684<code>column1<\/code>\u548c<code>column2<\/code>\u7684\u7d44\u5408\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8distinct%e9%97%9c%e9%8d%b5%e5%ad%97-NjHbeFBAmx\">3. \u4f7f\u7528DISTINCT\u95dc\u9375\u5b57<\/h3>\n<p>\u5982\u679c\u53ea\u9700\u8981\u67e5\u8a62\u4e0d\u91cd\u8907\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528DISTINCT\u95dc\u9375\u5b57\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT DISTINCT column1, column2\nFROM your_table;\n<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de<code>your_table<\/code>\u4e2d<code>column1<\/code>\u548c<code>column2<\/code>\u7684\u552f\u4e00\u7d44\u5408\u3002<\/p>\n<h2 id=\"%e5%8e%bb%e9%87%8d%e6%93%8d%e4%bd%9c%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-NjHbeFBAmx\">\u53bb\u91cd\u64cd\u4f5c\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u53bb\u91cd\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u67e5\u8a62\uff1a<\/strong>\u5728\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u5148\u6e2c\u8a66\u67e5\u8a62\u4ee5\u78ba\u4fdd\u53ea\u522a\u9664\u91cd\u8907\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u53bb\u91cd\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NjHbeFBAmx\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u7684\u53bb\u91cd\u64cd\u4f5c\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u63d0\u9ad8\u6027\u80fd\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u901a\u904e\u4f7f\u7528ROW_NUMBER()\u51fd\u6578\u3001GROUP BY\u8a9e\u53e5\u548cDISTINCT\u95dc\u9375\u5b57\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u6578\u64da\u3002\u5728\u9032\u884c\u53bb\u91cd\u64cd\u4f5c\u6642\uff0c\u52d9\u5fc5\u6ce8\u610f\u6578\u64da\u5099\u4efd\u548c\u67e5\u8a62\u6e2c\u8a66\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u640d\u5931\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u6216\u5c0b\u627e\u9ad8\u6548\u7684<a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5feb\u901f\u5728Oracle\u6578\u64da\u5eab\u4e2d\u9032\u884c\u53bb\u91cd\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\uff0c\u512a\u5316\u67e5\u8a62\u6548\u7387\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-174673","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174673","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=174673"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174673\/revisions"}],"predecessor-version":[{"id":174674,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174673\/revisions\/174674"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=174673"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=174673"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=174673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}