{"id":94184,"date":"2024-10-19T18:42:20","date_gmt":"2024-10-19T10:42:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94184\/"},"modified":"2024-10-19T18:42:20","modified_gmt":"2024-10-19T10:42:20","slug":"oracle-rownum%e7%9a%84%e5%af%a6%e9%9a%9b%e7%94%a8%e6%b3%95%e7%9a%84%e5%bd%99%e7%b8%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94184\/","title":{"rendered":"Oracle rownum\u7684\u5be6\u969b\u7528\u6cd5\u7684\u5f59\u7e3d"},"content":{"rendered":"

Oracle rownum\u7684\u5be6\u969b\u7528\u6cd5\u7684\u5f59\u7e3d<\/h1>\n

\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0crownum<\/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\u6578\u64da\u6aa2\u7d22\u904e\u7a0b\u4e2d\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\u4f86\u63a7\u5236\u8fd4\u56de\u7684\u6578\u64da\u91cf\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0erownum<\/code>\u7684\u5be6\u969b\u7528\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u793a\u4f8b\u4f86\u5e6b\u52a9\u7406\u89e3\u5176\u529f\u80fd\u3002<\/p>\n

\u4ec0\u9ebc\u662frownum\uff1f<\/h2>\n

rownum<\/code>\u662f\u4e00\u500b\u5728Oracle\u4e2d\u81ea\u52d5\u751f\u6210\u7684\u6578\u5b57\uff0c\u8868\u793a\u67e5\u8a62\u7d50\u679c\u96c6\u4e2d\u6bcf\u4e00\u884c\u7684\u5e8f\u865f\u3002\u7576\u67e5\u8a62\u57f7\u884c\u6642\uff0cOracle\u6703\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500brownum<\/code>\u503c\uff0c\u5f9e1\u958b\u59cb\u905e\u589e\u3002\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u8f15\u9b06\u5730\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002<\/p>\n

rownum\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n

\u4f7f\u7528rownum<\/code>\u7684\u6700\u57fa\u672c\u65b9\u5f0f\u662f\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70baemployees<\/code>\u7684\u8868\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u524d10\u540d\u54e1\u5de5\u7684\u8cc7\u6599\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n

SELECT * FROM employees WHERE rownum <= 10;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56deemployees<\/code>\u8868\u4e2d\u7684\u524d10\u884c\u6578\u64da\u3002<\/p>\n
rownum\u7684\u9650\u5236<\/h2>\n
\u96d6\u7136rownum<\/code>\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u4e5f\u6709\u4e00\u4e9b\u9650\u5236\u3002\u6700\u4e3b\u8981\u7684\u9650\u5236\u662frownum<\/code>\u662f\u5728\u6578\u64da\u6aa2\u7d22\u904e\u7a0b\u4e2d\u5206\u914d\u7684\uff0c\u56e0\u6b64\u5728\u4f7f\u7528rownum<\/code>\u9032\u884c\u7be9\u9078\u6642\uff0c\u5fc5\u9808\u5c0f\u5fc3\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u4e0d\u6703\u8fd4\u56de\u9810\u671f\u7684\u7d50\u679c\uff1a<\/p>\n
SELECT * FROM employees WHERE rownum > 5;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5be6\u969b\u4e0a\u4e0d\u6703\u8fd4\u56de\u4efb\u4f55\u7d50\u679c\uff0c\u56e0\u70barownum<\/code>\u7684\u503c\u5f9e1\u958b\u59cb\uff0c\u6c92\u6709\u4efb\u4f55\u884c\u7684rownum<\/code>\u6703\u5927\u65bc5\u3002<\/p>\n
\u4f7f\u7528rownum\u9032\u884c\u5206\u9801<\/h2>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0crownum<\/code>\u5e38\u7528\u65bc\u5be6\u73fe\u5206\u9801\u529f\u80fd\u3002\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u7b2c6\u5230\u7b2c15\u540d\u54e1\u5de5\u7684\u8cc7\u6599\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
\nSELECT * FROM (\n    SELECT e.*, rownum rnum FROM (\n        SELECT * FROM employees ORDER BY employee_id\n    ) e\n) WHERE rnum >= 6 AND rnum <= 15;\n<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u5c0demployees<\/code>\u8868\u9032\u884c\u6392\u5e8f\uff0c\u7136\u5f8c\u70ba\u6bcf\u4e00\u884c\u5206\u914drownum<\/code>\uff0c\u6700\u5f8c\u7be9\u9078\u51fa\u6240\u9700\u7684\u884c\u3002<\/p>\n
\u7d50\u5408rownum\u548c\u5176\u4ed6\u689d\u4ef6<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u7d50\u5408rownum<\/code>\u548c\u5176\u4ed6\u689d\u4ef6\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u67e5\u8a62\u85aa\u6c34\u9ad8\u65bc\u67d0\u500b\u503c\u7684\u524d10\u540d\u54e1\u5de5\uff1a<\/p>\n
\nSELECT * FROM (\n    SELECT * FROM employees WHERE salary > 50000\n) WHERE rownum <= 10;\n<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u6c34\u9ad8\u65bc50000\u7684\u524d10\u540d\u54e1\u5de5\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7e3d\u7684\u4f86\u8aaa\uff0crownum<\/code>\u5728Oracle\u6578\u64da\u5eab\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u63a7\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u7121\u8ad6\u662f\u7528\u65bc\u7c21\u55ae\u7684\u884c\u6578\u9650\u5236\uff0c\u9084\u662f\u7528\u65bc\u5be6\u73fe\u5206\u9801\u529f\u80fd\uff0crownum<\/code>\u90fd\u80fd\u63d0\u4f9b\u9748\u6d3b\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u4e86\u89e3rownum<\/code>\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u9650\u5236\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u5728\u6578\u64da\u67e5\u8a62\u4e2d\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bcrownum<\/code>\u7684\u4f7f\u7528\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u8005\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u9ad4\u9a57\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle rownum\u7684\u5be6\u969b\u7528\u6cd5\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u9650\u5236\u67e5\u8a62\u7d50\u679c\u548c\u512a\u5316\u6578\u64da\u6aa2\u7d22\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-94184","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94184","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=94184"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94184\/revisions"}],"predecessor-version":[{"id":94185,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94184\/revisions\/94185"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}