{"id":96248,"date":"2024-10-20T07:50:16","date_gmt":"2024-10-19T23:50:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96248\/"},"modified":"2024-10-20T07:50:17","modified_gmt":"2024-10-19T23:50:17","slug":"oracle%e4%b8%ad%e6%9f%a5%e8%a9%a2rownum%e5%92%8crowid%e7%9a%84%e5%8d%80%e5%88%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96248\/","title":{"rendered":"Oracle\u4e2d\u67e5\u8a62rownum\u548crowid\u7684\u5340\u5225"},"content":{"rendered":"<h1 id=\"oracle%e4%b8%ad%e6%9f%a5%e8%a9%a2rownum%e5%92%8crowid%e7%9a%84%e5%8d%80%e5%88%a5-OlngpYgYzL\">Oracle\u4e2d\u67e5\u8a62rownum\u548crowid\u7684\u5340\u5225<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c<code>rownum<\/code>\u548c<code>rowid<\/code>\u662f\u5169\u500b\u5e38\u7528\u7684\u6982\u5ff5\uff0c\u96d6\u7136\u5b83\u5011\u7684\u540d\u7a31\u76f8\u4f3c\uff0c\u4f46\u5176\u529f\u80fd\u548c\u7528\u9014\u537b\u6709\u8457\u660e\u986f\u7684\u5340\u5225\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u5b9a\u7fa9\u3001\u7528\u6cd5\u53ca\u5176\u5728\u67e5\u8a62\u4e2d\u7684\u4e0d\u540c\u4e4b\u8655\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afrownum%ef%bc%9f-OlngpYgYzL\">\u4ec0\u9ebc\u662frownum\uff1f<\/h2>\n<p><code>rownum<\/code>\u662f\u4e00\u500b\u865b\u64ec\u5217\uff0c\u7528\u65bc\u8868\u793a\u67e5\u8a62\u7d50\u679c\u96c6\u4e2d\u6bcf\u4e00\u884c\u7684\u5e8f\u865f\u3002\u7576\u4f60\u57f7\u884c\u4e00\u500b\u67e5\u8a62\u6642\uff0cOracle\u6703\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u5f9e1\u958b\u59cb\u7684\u6574\u6578\u503c\uff0c\u9019\u500b\u503c\u5c31\u662f<code>rownum<\/code>\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c<code>rownum<\/code>\u662f\u5728\u7d50\u679c\u96c6\u751f\u6210\u7684\u904e\u7a0b\u4e2d\u5206\u914d\u7684\uff0c\u56e0\u6b64\u5b83\u7684\u503c\u662f\u6839\u64da\u67e5\u8a62\u7684\u57f7\u884c\u9806\u5e8f\u800c\u5b9a\u7684\u3002<\/p>\n<h3 id=\"rownum%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-OlngpYgYzL\">rownum\u7684\u4f7f\u7528\u7bc4\u4f8b<\/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\u9019\u662f\u56e0\u70ba<code>rownum<\/code>\u5728\u67e5\u8a62\u57f7\u884c\u6642\u88ab\u8ce6\u4e88\u4e86\u503c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afrowid%ef%bc%9f-OlngpYgYzL\">\u4ec0\u9ebc\u662frowid\uff1f<\/h2>\n<p><code>rowid<\/code>\u662fOracle\u6578\u64da\u5eab\u4e2d\u6bcf\u4e00\u884c\u7684\u552f\u4e00\u6a19\u8b58\u7b26\u3002\u5b83\u8868\u793a\u8a72\u884c\u5728\u6578\u64da\u6587\u4ef6\u4e2d\u7684\u7269\u7406\u4f4d\u7f6e\uff0c\u5305\u62ec\u6578\u64da\u6587\u4ef6\u7684ID\u3001\u5340\u584a\u865f\u548c\u884c\u865f\u3002\u7531\u65bc<code>rowid<\/code>\u662f\u552f\u4e00\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u7528\u4f86\u5feb\u901f\u5b9a\u4f4d\u548c\u8a2a\u554f\u7279\u5b9a\u7684\u884c\u3002<\/p>\n<h3 id=\"rowid%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-OlngpYgYzL\">rowid\u7684\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<pre><code>SELECT rowid, * FROM employees WHERE employee_id = 101;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<code>employee_id<\/code>\u70ba101\u7684\u54e1\u5de5\u7684\u6240\u6709\u4fe1\u606f\uff0c\u4e26\u540c\u6642\u986f\u793a\u8a72\u884c\u7684<code>rowid<\/code>\u3002<\/p>\n<h2 id=\"rownum%e8%88%87rowid%e7%9a%84%e4%b8%bb%e8%a6%81%e5%8d%80%e5%88%a5-OlngpYgYzL\">rownum\u8207rowid\u7684\u4e3b\u8981\u5340\u5225<\/h2>\n<ul>\n<li><strong>\u5b9a\u7fa9\uff1a<\/strong> <code>rownum<\/code>\u662f\u67e5\u8a62\u7d50\u679c\u96c6\u4e2d\u7684\u884c\u5e8f\u865f\uff0c\u800c<code>rowid<\/code>\u662f\u884c\u5728\u6578\u64da\u5eab\u4e2d\u7684\u7269\u7406\u5730\u5740\u3002<\/li>\n<li><strong>\u7528\u9014\uff1a<\/strong> <code>rownum<\/code>\u5e38\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u800c<code>rowid<\/code>\u5247\u7528\u65bc\u5feb\u901f\u5b9a\u4f4d\u548c\u8a2a\u554f\u7279\u5b9a\u884c\u3002<\/li>\n<li><strong>\u751f\u6210\u6642\u6a5f\uff1a<\/strong> <code>rownum<\/code>\u662f\u5728\u67e5\u8a62\u57f7\u884c\u904e\u7a0b\u4e2d\u751f\u6210\u7684\uff0c\u800c<code>rowid<\/code>\u662f\u6578\u64da\u5eab\u5728\u63d2\u5165\u6578\u64da\u6642\u81ea\u52d5\u5206\u914d\u7684\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-OlngpYgYzL\">\u4f7f\u7528\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>rownum<\/code>\u6642\uff0c\u9700\u6ce8\u610f\u5176\u5728\u67e5\u8a62\u4e2d\u7684\u884c\u70ba\u3002\u4f8b\u5982\uff0c\u7576\u4f7f\u7528<code>ORDER BY<\/code>\u5b50\u53e5\u6642\uff0c<code>rownum<\/code>\u7684\u503c\u53ef\u80fd\u4e0d\u6703\u5982\u9810\u671f\u90a3\u6a23\u53cd\u6620\u6392\u5e8f\u5f8c\u7684\u7d50\u679c\u3002\u70ba\u4e86\u6b63\u78ba\u4f7f\u7528<code>rownum<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u5148\u9032\u884c\u6392\u5e8f\uff0c\u518d\u9650\u5236\u884c\u6578\uff1a<\/p>\n<pre><code>SELECT * FROM (SELECT * FROM employees ORDER BY salary DESC) WHERE rownum &lt;= 5;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u7372\u5f97\u85aa\u8cc7\u6700\u9ad8\u7684\u524d\u4e94\u540d\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-OlngpYgYzL\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c<code>rownum<\/code>\u548c<code>rowid<\/code>\u5404\u81ea\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\u3002<code>rownum<\/code>\u7528\u65bc\u8868\u793a\u67e5\u8a62\u7d50\u679c\u7684\u884c\u5e8f\u865f\uff0c\u9069\u5408\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff1b\u800c<code>rowid<\/code>\u5247\u662f\u884c\u7684\u552f\u4e00\u6a19\u8b58\u7b26\uff0c\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u6578\u64da\u3002\u4e86\u89e3\u9019\u5169\u8005\u7684\u5340\u5225\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u64cd\u4f5c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u9700\u6c42\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u63d0\u4f9b\u5404\u985e<em><a href=\"https:\/\/server.hk\">VPS<\/a><\/em>\u89e3\u6c7a\u65b9\u6848\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u60a8\u7684\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u4e2drownum\u548crowid\u7684\u5340\u5225\uff0c\u638c\u63e1\u6578\u64da\u67e5\u8a62\u7684\u95dc\u9375\u6982\u5ff5\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u6548\u7387\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-96248","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96248","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=96248"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96248\/revisions"}],"predecessor-version":[{"id":96249,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96248\/revisions\/96249"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}