{"id":94186,"date":"2024-10-19T18:43:14","date_gmt":"2024-10-19T10:43:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94186\/"},"modified":"2024-10-19T18:43:15","modified_gmt":"2024-10-19T10:43:15","slug":"oracle-rownum%e7%94%a8%e6%b3%95%e7%9a%84%e6%ad%b8%e7%b4%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94186\/","title":{"rendered":"Oracle rownum\u7528\u6cd5\u7684\u6b78\u7d0d"},"content":{"rendered":"<h1 id=\"oracle-rownum%e7%94%a8%e6%b3%95%e7%9a%84%e6%ad%b8%e7%b4%8d-DBOdMZKyEM\">Oracle rownum\u7528\u6cd5\u7684\u6b78\u7d0d<\/h1>\n<p>\u5728Oracle\u8cc7\u6599\u5eab\u4e2d\uff0c<code>rownum<\/code>\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u4f3a\u670d\u5668\u7aef\u507d\u5217\uff0c\u4e3b\u8981\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u5b83\u5728\u67e5\u8a62\u57f7\u884c\u6642\u88ab\u5206\u914d\u7d66\u6bcf\u4e00\u884c\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u5206\u9801\u6216\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u6578\u91cf\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>rownum<\/code>\u7684\u7528\u6cd5\u53ca\u5176\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"rownum%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-DBOdMZKyEM\">rownum\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p><code>rownum<\/code>\u662fOracle\u8cc7\u6599\u5eab\u4e2d\u4e00\u500b\u7279\u6b8a\u7684\u507d\u5217\uff0c\u7576\u67e5\u8a62\u57f7\u884c\u6642\uff0cOracle\u6703\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\u3002\u9019\u500b\u884c\u865f\u5f9e1\u958b\u59cb\uff0c\u96a8\u8457\u884c\u7684\u589e\u52a0\u800c\u905e\u589e\u3002\u4f7f\u7528<code>rownum<\/code>\u53ef\u4ee5\u65b9\u4fbf\u5730\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5206\u9801\u986f\u793a\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"rownum%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-DBOdMZKyEM\">rownum\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f<code>rownum<\/code>\u7684\u4e00\u4e9b\u57fa\u672c\u7528\u6cd5\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c%e7%9a%84%e8%a1%8c%e6%95%b8-DBOdMZKyEM\">\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578<\/h3>\n<pre><code>SELECT * FROM employees WHERE rownum &lt;= 10;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de<code>employees<\/code>\u8868\u4e2d\u7684\u524d10\u884c\u6578\u64da\u3002<\/p>\n<h3 id=\"%e8%88%87order-by%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-DBOdMZKyEM\">\u8207ORDER BY\u7d50\u5408\u4f7f\u7528<\/h3>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c<code>rownum<\/code>\u7684\u5206\u914d\u662f\u5728\u67e5\u8a62\u57f7\u884c\u6642\u9032\u884c\u7684\uff0c\u56e0\u6b64\u5982\u679c\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528<code>ORDER BY<\/code>\uff0c\u53ef\u80fd\u6703\u5f97\u5230\u610f\u60f3\u4e0d\u5230\u7684\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM (SELECT * FROM employees ORDER BY salary DESC) WHERE rownum &lt;= 5;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u7684\u610f\u5716\u662f\u7372\u53d6\u85aa\u6c34\u6700\u9ad8\u7684\u524d5\u540d\u54e1\u5de5\uff0c\u4f46\u7531\u65bc<code>rownum<\/code>\u662f\u5728\u5916\u5c64\u67e5\u8a62\u4e2d\u8a08\u7b97\u7684\uff0c\u56e0\u6b64\u5be6\u969b\u4e0a\u6703\u8fd4\u56de\u4efb\u610f5\u884c\u3002\u6b63\u78ba\u7684\u505a\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM (SELECT * FROM employees ORDER BY salary DESC) WHERE rownum &lt;= 5 ORDER BY salary DESC;<\/code><\/pre>\n<h2 id=\"rownum%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-DBOdMZKyEM\">rownum\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u884c\u865f\u7684\u5206\u914d\u9806\u5e8f\uff1a<\/strong>\u5982\u524d\u6240\u8ff0\uff0c<code>rownum<\/code>\u662f\u5728\u67e5\u8a62\u57f7\u884c\u6642\u5206\u914d\u7684\uff0c\u56e0\u6b64\u5728\u4f7f\u7528<code>ORDER BY<\/code>\u6642\u9700\u8b39\u614e\u3002<\/li>\n<li><strong>\u8207\u5176\u4ed6\u689d\u4ef6\u7684\u7d50\u5408\uff1a<\/strong>\u5728\u4f7f\u7528<code>rownum<\/code>\u6642\uff0c\u61c9\u8a72\u6ce8\u610f\u8207\u5176\u4ed6\u67e5\u8a62\u689d\u4ef6\u7684\u7d50\u5408\uff0c\u907f\u514d\u51fa\u73fe\u908f\u8f2f\u932f\u8aa4\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u4f7f\u7528<code>rownum<\/code>\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u9032\u884c\u6027\u80fd\u6e2c\u8a66\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-DBOdMZKyEM\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0c<code>rownum<\/code>\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u6642\u9700\u8981\u6ce8\u610f\u5176\u5206\u914d\u9806\u5e8f\u53ca\u8207\u5176\u4ed6\u67e5\u8a62\u689d\u4ef6\u7684\u7d50\u5408\u3002\u6b63\u78ba\u5730\u4f7f\u7528<code>rownum<\/code>\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u4e26\u4f7f\u6578\u64da\u8655\u7406\u66f4\u52a0\u9748\u6d3b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc<code>rownum<\/code>\u7684\u4f7f\u7528\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u662f\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u4e2drownum\u7684\u7528\u6cd5\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u9650\u5236\u67e5\u8a62\u7d50\u679c\u548c\u9032\u884c\u6578\u64da\u5206\u9801\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-94186","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94186","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=94186"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94186\/revisions"}],"predecessor-version":[{"id":94187,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94186\/revisions\/94187"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}