{"id":199926,"date":"2025-05-06T11:31:21","date_gmt":"2025-05-06T03:31:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199926\/"},"modified":"2025-05-06T11:31:21","modified_gmt":"2025-05-06T03:31:21","slug":"%e5%a4%84%e7%90%86oracle%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e7%9a%84%e9%87%8d%e5%a4%8d%e6%95%b0%e6%8d%ae%ef%bc%9a%e5%8e%bb%e9%99%a4%e9%87%8d%e5%a4%8d%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199926\/","title":{"rendered":"\u5904\u7406Oracle\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570\u636e\uff1a\u53bb\u9664\u91cd\u590d\u9879"},"content":{"rendered":"

<\/b> <\/p>\n

\u5904\u7406Oracle\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570\u636e\uff1a\u53bb\u9664\u91cd\u590d\u9879<\/h1>\n

\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n

\u5728\u5b9e\u9645\u6570\u636e\u5e93\u7ba1\u7406\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u91cd\u590d\u6570\u636e\u7684\u60c5\u51b5\uff0c\u8fd9\u4e9b\u91cd\u590d\u6570\u636e\u4e0d\u4ec5\u4f1a\u5360\u7528\u6570\u636e\u5e93\u7a7a\u95f4\uff0c\u8fd8\u4f1a\u5f71\u54cd\u67e5\u8be2\u548c\u5206\u6790\u7684\u6548\u7387\u3002\u9488\u5bf9Oracle\u6570\u636e\u5e93\u4e2d\u91cd\u590d\u6570\u636e\u7684\u5904\u7406\uff0c\u672c\u6587\u5c06\u4ecb\u7ecd\u4e00\u79cd\u65b9\u6cd5\uff1a\u53ea\u63d0\u53d6\u4e00\u6761\u91cd\u590d\u6570\u636e\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684SQL\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

\u9996\u5148\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a\u201cemployee\u201d\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u5458\u5de5\u4fe1\u606f\uff0c\u53ef\u80fd\u5b58\u5728\u91cd\u590d\u6570\u636e\u3002\u6211\u4eec\u5e0c\u671b\u9488\u5bf9\u91cd\u590d\u7684\u5458\u5de5\u4fe1\u606f\u53ea\u63d0\u53d6\u4e00\u6761\u6570\u636e\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a<\/p>\n

    \n
  1. \u4f7f\u7528ROW_NUMBER()\u7a97\u53e3\u51fd\u6570\u4e3a\u6bcf\u6761\u6570\u636e\u6dfb\u52a0\u884c\u53f7\u3002<\/li>\n
  2. \u6839\u636e\u9700\u8981\u53bb\u9664\u91cd\u590d\u884c\u53f7\u5927\u4e8e1\u7684\u6570\u636e\u3002<\/li>\n<\/ol>\n

    \u5177\u4f53\u7684SQL\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n

    SELECT *\nFROM (\n    SELECT emp.*, ROW_NUMBER() OVER(PARTITION BY emp.employee_id ORDER BY emp.employee_id) AS rn\n    FROM employee emp\n) temp\nWHERE temp.rn = 1;<\/pre>\n
    \u4ee5\u4e0aSQL\u8bed\u53e5\u5c06\u6211\u4eec\u7684\u76ee\u6807\u5206\u4e3a\u4e24\u6b65\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u901a\u8fc7ROW_NUMBER()\u7a97\u53e3\u51fd\u6570\u4e3a\u6bcf\u6761\u5458\u5de5\u6570\u636e\u6dfb\u52a0\u884c\u53f7\uff0cPARTITION BY\u5b50\u53e5\u6307\u5b9a\u6839\u636e\u5458\u5de5ID\u8fdb\u884c\u5206\u7ec4\uff0cORDER BY\u5b50\u53e5\u53ef\u4ee5\u6309\u7167\u9700\u8981\u6307\u5b9a\u6392\u5e8f\u65b9\u5f0f\u3002\u7136\u540e\uff0c\u5c06\u5305\u542b\u884c\u53f7\u4e3a1\u7684\u6570\u636e\u7b5b\u9009\u51fa\u6765\uff0c\u5373\u4fdd\u7559\u6bcf\u4e2a\u5458\u5de5ID\u4e0b\u7684\u7b2c\u4e00\u6761\u6570\u636e\uff0c\u4ece\u800c\u5b9e\u73b0\u53bb\u9664\u91cd\u590d\u6570\u636e\u7684\u76ee\u7684\u3002<\/p>\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4ee5\u4e0aSQL\u4ee3\u7801\u793a\u4f8b\u4ec5\u4e3a\u5c55\u793a\u4e00\u79cd\u65b9\u6cd5\uff0c\u5177\u4f53\u60c5\u51b5\u8fd8\u9700\u6839\u636e\u6570\u636e\u8868\u7ed3\u6784\u548c\u4e1a\u52a1\u9700\u6c42\u8fdb\u884c\u8c03\u6574\u548c\u4f18\u5316\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u5176\u4ed6\u65b9\u6cd5\uff0c\u5982\u4f7f\u7528\u5206\u7ec4\u51fd\u6570\u3001\u81ea\u8fde\u63a5\u7b49\u65b9\u5f0f\u5904\u7406\u91cd\u590d\u6570\u636e\u3002<\/p>\n
    \u7efc\u4e0a\u6240\u8ff0\uff0c\u901a\u8fc7\u5408\u9002\u7684SQL\u8bed\u53e5\u548c\u6280\u5de7\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u6548\u5904\u7406Oracle\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570\u636e\uff0c\u63d0\u53d6\u51fa\u552f\u4e00\u7684\u4e00\u6761\u6570\u636e\uff0c\u4ece\u800c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6548\u7387\u548c\u7ba1\u7406\u8d28\u91cf\u3002\u5e0c\u671b\u672c\u6587\u63d0\u4f9b\u7684\u65b9\u6cd5\u80fd\u591f\u5bf9\u5904\u7406\u91cd\u590d\u6570\u636e\u95ee\u9898\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
    \u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300a\u5904\u7406Oracle\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570\u636e\uff1a\u53bb\u9664\u91cd\u590d\u9879\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6570\u636e\u5e93\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5904\u7406Oracle\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199926","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199926","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199926"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199926\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199926"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}