{"id":162919,"date":"2024-11-04T19:07:19","date_gmt":"2024-11-04T11:07:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162919\/"},"modified":"2024-11-04T19:07:20","modified_gmt":"2024-11-04T11:07:20","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%baoracle%e5%88%86%e9%a0%81%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e9%87%8d%e5%be%a9%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162919\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u89e3\u6c7aoracle\u5206\u9801\u67e5\u8a62\u6578\u64da\u91cd\u5fa9\u554f\u984c"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%baoracle%e5%88%86%e9%a0%81%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e9%87%8d%e5%be%a9%e5%95%8f%e9%a1%8c-fMNemRXJwt\">\u6559\u60a8\u5982\u4f55\u89e3\u6c7aOracle\u5206\u9801\u67e5\u8a62\u6578\u64da\u91cd\u5fa9\u554f\u984c<\/h1>\n<p>\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u9032\u884c\u5206\u9801\u67e5\u8a62\u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u6578\u64da\u91cd\u5fa9\u7684\u554f\u984c\u3002\u9019\u4e0d\u50c5\u5f71\u97ff\u4e86\u67e5\u8a62\u7d50\u679c\u7684\u6e96\u78ba\u6027\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u4e0b\u964d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9020\u6210\u6578\u64da\u91cd\u5fa9\u7684\u539f\u56e0\uff0c\u4e26\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u8655\u7406\u9019\u4e00\u554f\u984c\u3002<\/p>\n<h2 id=\"%e5%88%86%e9%a0%81%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-fMNemRXJwt\">\u5206\u9801\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5206\u9801\u67e5\u8a62\u662f\u6307\u5c07\u67e5\u8a62\u7d50\u679c\u5206\u6210\u591a\u500b\u9801\u9762\uff0c\u4ee5\u4fbf\u7528\u6236\u80fd\u5920\u66f4\u65b9\u4fbf\u5730\u67e5\u770b\u6578\u64da\u3002\u9019\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u5c24\u70ba\u91cd\u8981\u3002\u901a\u5e38\uff0c\u5206\u9801\u67e5\u8a62\u6703\u4f7f\u7528 <code>ROWNUM<\/code> \u6216 <code>ROW_NUMBER()<\/code> \u51fd\u6578\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e9%87%8d%e5%be%a9%e7%9a%84%e5%8e%9f%e5%9b%a0-fMNemRXJwt\">\u6578\u64da\u91cd\u5fa9\u7684\u539f\u56e0<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u6578\u64da\u91cd\u5fa9\u7684\u554f\u984c\u901a\u5e38\u7531\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u5f15\u8d77\uff1a<\/p>\n<ul>\n<li><strong>JOIN\u64cd\u4f5c\uff1a<\/strong>\u7576\u4f7f\u7528JOIN\u64cd\u4f5c\u6642\uff0c\u5982\u679c\u95dc\u806f\u7684\u8868\u4e2d\u5b58\u5728\u91cd\u5fa9\u7684\u6578\u64da\uff0c\u5247\u6700\u7d42\u7684\u67e5\u8a62\u7d50\u679c\u4e2d\u53ef\u80fd\u6703\u51fa\u73fe\u91cd\u5fa9\u7684\u884c\u3002<\/li>\n<li><strong>\u7f3a\u4e4f\u552f\u4e00\u6a19\u8b58\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u7684\u8868\u4e2d\u6c92\u6709\u660e\u78ba\u7684\u552f\u4e00\u6a19\u8b58\uff08\u5982\u4e3b\u9375\uff09\uff0c\u5247\u5728\u5206\u9801\u67e5\u8a62\u4e2d\u53ef\u80fd\u6703\u51fa\u73fe\u91cd\u5fa9\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u4e0d\u7576\u7684\u5206\u9801\u908f\u8f2f\uff1a<\/strong>\u5728\u5be6\u73fe\u5206\u9801\u908f\u8f2f\u6642\uff0c\u5982\u679c\u6c92\u6709\u6b63\u78ba\u8655\u7406\u6578\u64da\u7684\u7be9\u9078\u689d\u4ef6\uff0c\u5247\u53ef\u80fd\u5c0e\u81f4\u91cd\u5fa9\u7684\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-fMNemRXJwt\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7aOracle\u5206\u9801\u67e5\u8a62\u4e2d\u7684\u6578\u64da\u91cd\u5fa9\u554f\u984c\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8distinct%e9%97%9c%e9%8d%b5%e5%ad%97-fMNemRXJwt\">1. \u4f7f\u7528DISTINCT\u95dc\u9375\u5b57<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 <code>DISTINCT<\/code> \u95dc\u9375\u5b57\u53ef\u4ee5\u5e6b\u52a9\u904e\u6ffe\u6389\u91cd\u5fa9\u7684\u884c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT DISTINCT column1, column2\nFROM your_table\nWHERE conditions\nORDER BY column1\nOFFSET :offset ROWS FETCH NEXT :limit ROWS ONLY;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u8fd4\u56de\u7684\u7d50\u679c\u96c6\u4e2d\u4e0d\u6703\u6709\u91cd\u5fa9\u7684\u884c\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-fMNemRXJwt\">2. \u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h3>\n<p>\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \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\u9032\u884c\u5206\u9801\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>WITH RankedData AS (\n    SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1 ORDER BY column2) AS rn\n    FROM your_table\n)\nSELECT column1, column2\nFROM RankedData\nWHERE rn = 1\nORDER BY column1\nOFFSET :offset ROWS FETCH NEXT :limit ROWS ONLY;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u500b\u5206\u7d44\u4e2d\u53ea\u8fd4\u56de\u4e00\u884c\u6578\u64da\uff0c\u5f9e\u800c\u907f\u514d\u91cd\u5fa9\u3002<\/p>\n<h3 id=\"3-%e7%a2%ba%e4%bf%9d%e6%9f%a5%e8%a9%a2%e6%a2%9d%e4%bb%b6%e7%9a%84%e5%94%af%e4%b8%80%e6%80%a7-fMNemRXJwt\">3. \u78ba\u4fdd\u67e5\u8a62\u689d\u4ef6\u7684\u552f\u4e00\u6027<\/h3>\n<p>\u5728\u8a2d\u8a08\u67e5\u8a62\u6642\uff0c\u61c9\u78ba\u4fdd\u67e5\u8a62\u689d\u4ef6\u7684\u552f\u4e00\u6027\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u4e3b\u9375\u6216\u552f\u4e00\u7d22\u5f15\u4f5c\u70ba\u67e5\u8a62\u7684\u689d\u4ef6\uff0c\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u91cd\u5fa9\u6578\u64da\u7684\u51fa\u73fe\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fMNemRXJwt\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u4e2d\u9032\u884c\u5206\u9801\u67e5\u8a62\u6642\uff0c\u6578\u64da\u91cd\u5fa9\u554f\u984c\u662f\u5e38\u898b\u7684\u6311\u6230\u4e4b\u4e00\u3002\u901a\u904e\u4f7f\u7528 <code>DISTINCT<\/code> \u95dc\u9375\u5b57\u3001<code>ROW_NUMBER()<\/code> \u51fd\u6578\u4ee5\u53ca\u78ba\u4fdd\u67e5\u8a62\u689d\u4ef6\u7684\u552f\u4e00\u6027\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e00\u554f\u984c\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u7d50\u679c\u7684\u6e96\u78ba\u6027\uff0c\u9084\u80fd\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u89e3\u6c7aOracle\u5206\u9801\u67e5\u8a62\u4e2d\u7684\u6578\u64da\u91cd\u5fa9\u554f\u984c\uff0c\u63d0\u5347\u67e5\u8a62\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-162919","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162919","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=162919"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162919\/revisions"}],"predecessor-version":[{"id":162920,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162919\/revisions\/162920"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}