{"id":95120,"date":"2024-10-19T22:24:18","date_gmt":"2024-10-19T14:24:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95120\/"},"modified":"2024-10-19T22:24:18","modified_gmt":"2024-10-19T14:24:18","slug":"oracle%e5%88%86%e9%a0%81%e8%aa%9e%e5%8f%a5%e4%b8%ad%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e4%bb%a3%e7%a2%bc%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95120\/","title":{"rendered":"Oracle\u5206\u9801\u8a9e\u53e5\u4e2d\u7684\u5be6\u969b\u61c9\u7528\u4ee3\u78bc\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"

Oracle\u5206\u9801\u8a9e\u53e5\u4e2d\u7684\u5be6\u969b\u61c9\u7528\u4ee3\u78bc\u6709\u54ea\u4e9b\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5206\u9801\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u5206\u9801\u529f\u80fd\uff0c\u9019\u5c0d\u65bc\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u548c\u7528\u6236\u9ad4\u9a57\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u5206\u9801\u8a9e\u53e5\u7684\u5be6\u969b\u61c9\u7528\u4ee3\u78bc\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u793a\u4f8b\u4f86\u5e6b\u52a9\u7406\u89e3\u5176\u7528\u6cd5\u3002<\/p>\n

\u5206\u9801\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5206\u9801\u662f\u6307\u5c07\u67e5\u8a62\u7d50\u679c\u5206\u6210\u591a\u500b\u9801\u9762\u986f\u793a\uff0c\u901a\u5e38\u7528\u65bc\u986f\u793a\u5927\u91cf\u6578\u64da\u7684\u60c5\u6cc1\u3002\u7528\u6236\u53ef\u4ee5\u901a\u904e\u7ffb\u9801\u4f86\u67e5\u770b\u4e0d\u540c\u7684\u6578\u64da\u96c6\u3002\u9019\u6a23\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u6539\u5584\u7528\u6236\u754c\u9762\u3002<\/p>\n

Oracle\u4e2d\u7684\u5206\u9801\u65b9\u6cd5<\/h2>\n

\u5728Oracle\u4e2d\uff0c\u5be6\u73fe\u5206\u9801\u7684\u4e3b\u8981\u65b9\u6cd5\u6709\u5169\u7a2e\uff1a\u4f7f\u7528ROWNUM\u548c\u4f7f\u7528ROW_NUMBER()\u51fd\u6578\u3002\u4ee5\u4e0b\u5c07\u8a73\u7d30\u4ecb\u7d39\u9019\u5169\u7a2e\u65b9\u6cd5\u3002<\/p>\n

1. \u4f7f\u7528ROWNUM<\/h3>\n

ROWNUM\u662f\u4e00\u500b\u865b\u64ec\u5217\uff0c\u8868\u793a\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u884c\u865f\u3002\u4f7f\u7528ROWNUM\u9032\u884c\u5206\u9801\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

\nSELECT * FROM (\n    SELECT a.*, ROWNUM rnum FROM (\n        SELECT * FROM your_table ORDER BY your_column\n    ) a WHERE ROWNUM  :start_row;\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c:start_row\u548c:end_row\u662f\u7528\u6236\u6307\u5b9a\u7684\u53c3\u6578\uff0c\u5206\u5225\u8868\u793a\u8d77\u59cb\u884c\u548c\u7d50\u675f\u884c\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u9ede\u662f\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n
2. \u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h3>\n
ROW_NUMBER()\u662f\u4e00\u500b\u7a97\u53e3\u51fd\u6578\uff0c\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u9032\u884c\u5206\u9801\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\nSELECT * FROM (\n    SELECT your_table.*, ROW_NUMBER() OVER (ORDER BY your_column) AS row_num\n    FROM your_table\n) WHERE row_num BETWEEN :start_row AND :end_row;\n<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0cROW_NUMBER()\u51fd\u6578\u70ba\u6bcf\u4e00\u884c\u751f\u6210\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\uff0c\u7136\u5f8c\u901a\u904eWHERE\u5b50\u53e5\u9032\u884c\u7be9\u9078\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5b83\u80fd\u5920\u66f4\u597d\u5730\u8655\u7406\u6392\u5e8f\u548c\u5206\u7d44\u7684\u9700\u6c42\u3002<\/p>\n
\u5be6\u969b\u61c9\u7528\u793a\u4f8b<\/h2>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u5be6\u969b\u7684\u61c9\u7528\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u6309\u201csalary\u201d\u5b57\u6bb5\u9032\u884c\u5206\u9801\u986f\u793a\uff1a<\/p>\n
\n-- \u4f7f\u7528ROWNUM\u9032\u884c\u5206\u9801\nSELECT * FROM (\n    SELECT e.*, ROWNUM rnum FROM (\n        SELECT * FROM employees ORDER BY salary DESC\n    ) e WHERE ROWNUM  0;\n\n-- \u4f7f\u7528ROW_NUMBER()\u9032\u884c\u5206\u9801\nSELECT * FROM (\n    SELECT e.*, ROW_NUMBER() OVER (ORDER BY salary DESC) AS row_num\n    FROM employees e\n) WHERE row_num BETWEEN 1 AND 10;\n<\/code><\/pre>\n
\u5728\u9019\u4e9b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u9700\u8981\u8abf\u6574\u8d77\u59cb\u884c\u548c\u7d50\u675f\u884c\u7684\u53c3\u6578\uff0c\u4ee5\u7372\u53d6\u4e0d\u540c\u7684\u6578\u64da\u96c6\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u5206\u9801\u529f\u80fd\uff0c\u7121\u8ad6\u662f\u4f7f\u7528ROWNUM\u9084\u662fROW_NUMBER()\u51fd\u6578\uff0c\u90fd\u80fd\u6709\u6548\u5730\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u986f\u793a\u9700\u6c42\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\u548c\u6027\u80fd\u9700\u6c42\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u6211\u5011\u63d0\u4f9b\u5404\u7a2e\u9999\u6e2fVPS<\/a><\/em>\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u548c\u61c9\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle\u5206\u9801\u8a9e\u53e5\u7684\u5be6\u969b\u61c9\u7528\u4ee3\u78bc\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u7ba1\u7406\u6578\u64da\u67e5\u8a62\u548c\u986f\u793a\u7d50\u679c\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-95120","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95120","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=95120"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95120\/revisions"}],"predecessor-version":[{"id":95121,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95120\/revisions\/95121"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}