{"id":162933,"date":"2024-11-04T19:14:19","date_gmt":"2024-11-04T11:14:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162933\/"},"modified":"2024-11-04T19:14:20","modified_gmt":"2024-11-04T11:14:20","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bedb2%e8%a1%8c%e8%bd%89%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162933\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u5be6\u73feDB2\u884c\u8f49\u5217"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bedb2%e8%a1%8c%e8%bd%89%e5%88%97-dGuzfwpzjT\">\u6559\u60a8\u5982\u4f55\u5be6\u73feDB2\u884c\u8f49\u5217<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u884c\u8f49\u5217\uff08Row to Column\uff09\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u5831\u544a\u548c\u6578\u64da\u5206\u6790\u4e2d\u3002DB2\u4f5c\u70baIBM\u7684\u4e00\u6b3e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u884c\u8f49\u5217\u7684\u529f\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728DB2\u4e2d\u5be6\u73fe\u884c\u8f49\u5217\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e8%a1%8c%e8%bd%89%e5%88%97%e7%9a%84%e6%a6%82%e5%bf%b5-dGuzfwpzjT\">\u884c\u8f49\u5217\u7684\u6982\u5ff5<\/h2>\n<p>\u884c\u8f49\u5217\u662f\u6307\u5c07\u6578\u64da\u8868\u4e2d\u7684\u884c\u6578\u64da\u8f49\u63db\u70ba\u5217\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u901a\u5e38\u7528\u65bc\u5c07\u591a\u884c\u6578\u64da\u532f\u7e3d\u5230\u4e00\u884c\u4e2d\uff0c\u4ee5\u4fbf\u66f4\u65b9\u4fbf\u5730\u9032\u884c\u5206\u6790\u548c\u5831\u544a\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u92b7\u552e\u6578\u64da\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e0d\u540c\u7522\u54c1\u7684\u92b7\u552e\u6578\u64da\uff0c\u6211\u5011\u53ef\u80fd\u5e0c\u671b\u5c07\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u6578\u64da\u986f\u793a\u5728\u540c\u4e00\u884c\u4e2d\uff0c\u800c\u4e0d\u662f\u5206\u6563\u5728\u591a\u884c\u4e2d\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8db2%e7%9a%84%e8%a1%8c%e8%bd%89%e5%88%97%e5%8a%9f%e8%83%bd-dGuzfwpzjT\">\u4f7f\u7528DB2\u7684\u884c\u8f49\u5217\u529f\u80fd<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u884c\u8f49\u5217\uff0c\u6700\u5e38\u898b\u7684\u65b9\u5f0f\u662f\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548cCASE\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8case%e8%aa%9e%e5%8f%a5-dGuzfwpzjT\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528CASE\u8a9e\u53e5<\/h3>\n<p>\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u6578\u91cf\u8f03\u5c11\u7684\u884c\u8f49\u5217\u60c5\u6cc1\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT \n    \u5ba2\u6236ID,\n    MAX(CASE WHEN \u7522\u54c1 = '\u7522\u54c1A' THEN \u92b7\u552e\u984d ELSE 0 END) AS \u7522\u54c1A\u92b7\u552e,\n    MAX(CASE WHEN \u7522\u54c1 = '\u7522\u54c1B' THEN \u92b7\u552e\u984d ELSE 0 END) AS \u7522\u54c1B\u92b7\u552e,\n    MAX(CASE WHEN \u7522\u54c1 = '\u7522\u54c1C' THEN \u92b7\u552e\u984d ELSE 0 END) AS \u7522\u54c1C\u92b7\u552e\nFROM \n    \u92b7\u552e\u6578\u64da\nGROUP BY \n    \u5ba2\u6236ID;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86MAX\u51fd\u6578\u548cCASE\u8a9e\u53e5\u4f86\u5c07\u4e0d\u540c\u7522\u54c1\u7684\u92b7\u552e\u984d\u8f49\u63db\u70ba\u5217\u3002\u9019\u6a23\uff0c\u6bcf\u500b\u5ba2\u6236\u7684\u92b7\u552e\u6578\u64da\u5c07\u986f\u793a\u5728\u540c\u4e00\u884c\u4e2d\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8pivot%e5%8a%9f%e8%83%bd-dGuzfwpzjT\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528PIVOT\u529f\u80fd<\/h3>\n<p>DB2\u4e5f\u652f\u6301PIVOT\u529f\u80fd\uff0c\u9019\u4f7f\u5f97\u884c\u8f49\u5217\u7684\u64cd\u4f5c\u66f4\u52a0\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528PIVOT\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * \nFROM \n    (SELECT \u5ba2\u6236ID, \u7522\u54c1, \u92b7\u552e\u984d FROM \u92b7\u552e\u6578\u64da) AS \u6e90\u6578\u64da\nPIVOT \n    (SUM(\u92b7\u552e\u984d) FOR \u7522\u54c1 IN ('\u7522\u54c1A' AS \u7522\u54c1A, '\u7522\u54c1B' AS \u7522\u54c1B, '\u7522\u54c1C' AS \u7522\u54c1C)) AS \u8f49\u63db\u6578\u64da;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u9078\u64c7\u4e86\u9700\u8981\u7684\u6578\u64da\uff0c\u7136\u5f8c\u4f7f\u7528PIVOT\u5c07\u7522\u54c1\u7684\u92b7\u552e\u984d\u8f49\u63db\u70ba\u5217\u3002\u9019\u6a23\u7684\u67e5\u8a62\u66f4\u52a0\u7c21\u6f54\uff0c\u6613\u65bc\u7406\u89e3\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-dGuzfwpzjT\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u884c\u8f49\u5217\u64cd\u4f5c\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\uff1a\u5728\u8f49\u63db\u904e\u7a0b\u4e2d\uff0c\u5fc5\u9808\u78ba\u4fdd\u6bcf\u500b\u7d44\u5408\u7684\u6578\u64da\u662f\u552f\u4e00\u7684\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u932f\u8aa4\u3002<\/li>\n<li>\u6027\u80fd\u8003\u91cf\uff1a\u884c\u8f49\u5217\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u9032\u884c\u6b64\u985e\u64cd\u4f5c\u6642\u9032\u884c\u6027\u80fd\u6e2c\u8a66\u3002<\/li>\n<li>\u6578\u64da\u985e\u578b\uff1a\u78ba\u4fdd\u5728\u8f49\u63db\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u4e00\u81f4\u6027\uff0c\u4ee5\u907f\u514d\u985e\u578b\u4e0d\u5339\u914d\u7684\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dGuzfwpzjT\">\u7e3d\u7d50<\/h2>\n<p>\u884c\u8f49\u5217\u662f\u4e00\u500b\u5728\u6578\u64da\u5206\u6790\u4e2d\u975e\u5e38\u6709\u7528\u7684\u6280\u8853\uff0cDB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u5305\u62ec\u4f7f\u7528CASE\u8a9e\u53e5\u548cPIVOT\u529f\u80fd\u3002\u901a\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u5c07\u884c\u6578\u64da\u8f49\u63db\u70ba\u5217\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u8b80\u6027\u548c\u5206\u6790\u6548\u7387\u3002\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u74b0\u5883\u4f86\u904b\u884cDB2\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728DB2\u4e2d\u5c07\u884c\u8f49\u63db\u70ba\u5217\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u64cd\u4f5c\uff0c\u5be6\u73fe\u9748\u6d3b\u7684\u6578\u64da\u5206\u6790\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-162933","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162933","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=162933"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162933\/revisions"}],"predecessor-version":[{"id":162934,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162933\/revisions\/162934"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}