{"id":94188,"date":"2024-10-19T18:44:18","date_gmt":"2024-10-19T10:44:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94188\/"},"modified":"2024-10-19T18:44:18","modified_gmt":"2024-10-19T10:44:18","slug":"oracle-rownum%e8%aa%9e%e5%8f%a5%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94188\/","title":{"rendered":"ORACLE ROWNUM\u8a9e\u53e5\u7684\u4f7f\u7528"},"content":{"rendered":"

ORACLE ROWNUM\u8a9e\u53e5\u7684\u4f7f\u7528<\/h1>\n

\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0cROWNUM\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u4f3a\u670d\u5668\u7aef\u865b\u64ec\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\u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n

ROWNUM\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

ROWNUM\u662f\u4e00\u500b\u4f3a\u670d\u5668\u751f\u6210\u7684\u6578\u5b57\uff0c\u8868\u793a\u67e5\u8a62\u7d50\u679c\u96c6\u4e2d\u6bcf\u4e00\u884c\u7684\u5e8f\u865f\u3002\u7576\u4e00\u500b\u67e5\u8a62\u88ab\u57f7\u884c\u6642\uff0cOracle\u6703\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500bROWNUM\uff0c\u5f9e1\u958b\u59cb\u905e\u589e\u3002\u9019\u610f\u5473\u8457ROWNUM\u7684\u503c\u5728\u67e5\u8a62\u57f7\u884c\u904e\u7a0b\u4e2d\u662f\u52d5\u614b\u751f\u6210\u7684\uff0c\u800c\u4e0d\u662f\u5b58\u5132\u5728\u6578\u64da\u8868\u4e2d\u7684\u4e00\u500b\u56fa\u5b9a\u503c\u3002<\/p>\n

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

\u4f7f\u7528ROWNUM\u7684\u6700\u5e38\u898b\u60c5\u6cc1\u662f\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u5f9e\u4e00\u500b\u540d\u70baEMPLOYEES\u7684\u8868\u4e2d\u9078\u64c7\u524d10\u540d\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n

SELECT * FROM EMPLOYEES WHERE ROWNUM <= 10;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56deEMPLOYEES\u8868\u4e2d\u7684\u524d10\u884c\u6578\u64da\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cROWNUM\u662f\u5728\u6578\u64da\u88ab\u6aa2\u7d22\u6642\u8a08\u7b97\u7684\uff0c\u56e0\u6b64\u5982\u679c\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528ROWNUM\uff0c\u5fc5\u9808\u78ba\u4fdd\u5b83\u662f\u5728\u6578\u64da\u6aa2\u7d22\u7684\u904e\u7a0b\u4e2d\u9032\u884c\u7684\u3002<\/p>\n
ROWNUM\u7684\u9650\u5236<\/h2>\n
\u96d6\u7136ROWNUM\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u4e5f\u6709\u4e00\u4e9b\u9650\u5236\u3002\u4f8b\u5982\uff0cROWNUM\u4e0d\u80fd\u76f4\u63a5\u7528\u65bc\u6392\u5e8f\u64cd\u4f5c\u3002\u9019\u662f\u56e0\u70baROWNUM\u662f\u5728\u6578\u64da\u6aa2\u7d22\u904e\u7a0b\u4e2d\u751f\u6210\u7684\uff0c\u800c\u6392\u5e8f\u662f\u5728\u6578\u64da\u6aa2\u7d22\u4e4b\u524d\u9032\u884c\u7684\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u9078\u64c7\u67d0\u500b\u6392\u5e8f\u5f8c\u7684\u524dN\u884c\uff0c\u5fc5\u9808\u4f7f\u7528\u5b50\u67e5\u8a62\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u7372\u53d6\u6309\u85aa\u6c34\u6392\u5e8f\u7684\u524d5\u540d\u54e1\u5de5\uff1a<\/p>\n
SELECT * FROM (SELECT * FROM EMPLOYEES ORDER BY SALARY DESC) WHERE ROWNUM <= 5;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5167\u90e8\u67e5\u8a62\u9996\u5148\u6309\u85aa\u6c34\u964d\u5e8f\u6392\u5217\u6240\u6709\u54e1\u5de5\uff0c\u7136\u5f8c\u5916\u90e8\u67e5\u8a62\u4f7f\u7528ROWNUM\u9650\u5236\u7d50\u679c\u70ba\u524d5\u540d\u3002<\/p>\n
ROWNUM\u8207\u5176\u4ed6\u529f\u80fd\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n
ROWNUM\u9084\u53ef\u4ee5\u8207\u5176\u4ed6Oracle\u529f\u80fd\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u5be6\u73fe\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u4f7f\u7528ROWNUM\u53ef\u4ee5\u8f15\u9b06\u5be6\u73fe\u5206\u9801\u529f\u80fd\u3002\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5f9eEMPLOYEES\u8868\u4e2d\u7372\u53d6\u7b2c11\u5230\u7b2c20\u540d\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT * FROM (SELECT a.*, ROWNUM rnum FROM (SELECT * FROM EMPLOYEES ORDER BY EMPLOYEE_ID) a WHERE ROWNUM <= 20) WHERE rnum > 10;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u9996\u5148\u9078\u64c7\u524d20\u540d\u54e1\u5de5\uff0c\u7136\u5f8c\u5f9e\u4e2d\u9078\u64c7\u7b2c11\u5230\u7b2c20\u540d\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
ROWNUM\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\u901a\u904e\u5408\u7406\u4f7f\u7528ROWNUM\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5be6\u73fe\u6578\u64da\u7684\u5206\u9801\u3001\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7b49\u529f\u80fd\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u5834\u666f\uff0c\u4e86\u89e3\u548c\u638c\u63e1ROWNUM\u7684\u4f7f\u7528\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u63d0\u4f9b\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3ORACLE ROWNUM\u8a9e\u53e5\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u638c\u63e1\u5982\u4f55\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u63d0\u9ad8\u6578\u64da\u67e5\u8a62\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-94188","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94188","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=94188"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94188\/revisions"}],"predecessor-version":[{"id":94189,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94188\/revisions\/94189"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}