{"id":187472,"date":"2024-11-11T14:33:28","date_gmt":"2024-11-11T06:33:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187472\/"},"modified":"2024-11-11T14:33:30","modified_gmt":"2024-11-11T06:33:30","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%8c%e5%88%97%e8%bd%89%e6%8f%9b%ef%bc%9a%e5%be%9e%e4%b8%80%e5%88%97%e5%a4%9a%e8%a1%8c%e5%88%b0%e4%b8%80%e8%a1%8c%e5%a4%9a%e5%88%97-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%80","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187472\/","title":{"rendered":"\u6578\u64da\u5eab\u884c\u5217\u8f49\u63db\uff1a\u5f9e\u4e00\u5217\u591a\u884c\u5230\u4e00\u884c\u591a\u5217 (\u6578\u64da\u5eab\u4e00\u5217\u591a\u884c\u8f49\u4e00\u884c\u591a\u5217)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%8c%e5%88%97%e8%bd%89%e6%8f%9b%ef%bc%9a%e5%be%9e%e4%b8%80%e5%88%97%e5%a4%9a%e8%a1%8c%e5%88%b0%e4%b8%80%e8%a1%8c%e5%a4%9a%e5%88%97-VsfxqOkZTM\">\u6578\u64da\u5eab\u884c\u5217\u8f49\u63db\uff1a\u5f9e\u4e00\u5217\u591a\u884c\u5230\u4e00\u884c\u591a\u5217<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u8f49\u63db\u548c\u91cd\u7d44\u662f\u5e38\u898b\u7684\u9700\u6c42\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5831\u544a\u548c\u6578\u64da\u5206\u6790\u6642\uff0c\u5c07\u6578\u64da\u5f9e\u4e00\u5217\u591a\u884c\u7684\u683c\u5f0f\u8f49\u63db\u70ba\u4e00\u884c\u591a\u5217\u7684\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u6578\u64da\u66f4\u6613\u65bc\u7406\u89e3\u548c\u4f7f\u7528\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u4e00\u904e\u7a0b\u7684\u57fa\u672c\u6982\u5ff5\u3001\u65b9\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 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id=\"%e8%a1%8c%e5%88%97%e8%bd%89%e6%8f%9b%e7%9a%84%e9%9c%80%e6%b1%82-VsfxqOkZTM\">\u884c\u5217\u8f49\u63db\u7684\u9700\u6c42<\/h2>\n<p>\u884c\u5217\u8f49\u63db\u7684\u9700\u6c42\u901a\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u532f\u7e3d\uff1a<\/strong>\u7576\u9700\u8981\u5c07\u591a\u500b\u8a18\u9304\u7684\u6578\u64da\u532f\u7e3d\u5230\u4e00\u500b\u5831\u544a\u4e2d\u6642\uff0c\u884c\u5217\u8f49\u63db\u53ef\u4ee5\u5e6b\u52a9\u5c07\u6578\u64da\u6574\u5408\u3002<\/li>\n<li><strong>\u6578\u64da\u53ef\u8996\u5316\uff1a<\/strong>\u5728\u9032\u884c\u6578\u64da\u53ef\u8996\u5316\u6642\uff0c\u5c07\u6578\u64da\u8f49\u63db\u70ba\u4e00\u884c\u591a\u5217\u7684\u683c\u5f0f\u53ef\u4ee5\u66f4\u597d\u5730\u5c55\u793a\u8da8\u52e2\u548c\u6a21\u5f0f\u3002<\/li>\n<li><strong>\u6578\u64da\u6e05\u7406\uff1a<\/strong>\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0c\u884c\u5217\u8f49\u63db\u53ef\u4ee5\u5e6b\u52a9\u6d88\u9664\u5197\u9918\u6578\u64da\uff0c\u7c21\u5316\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a1%8c%e5%88%97%e8%bd%89%e6%8f%9b%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e6%b3%95-VsfxqOkZTM\">\u884c\u5217\u8f49\u63db\u7684\u5be6\u73fe\u65b9\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u884c\u5217\u8f49\u63db\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548c\u689d\u4ef6\u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5c07\u4e00\u5217\u591a\u884c\u7684\u6578\u64da\u8f49\u63db\u70ba\u4e00\u884c\u591a\u5217\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e6%95%b8%e6%93%9a-VsfxqOkZTM\">\u793a\u4f8b\u6578\u64da<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre>\n| id | product | quantity |\n|----|---------|----------|\n| 1  | A       | 10       |\n| 2  | B       | 20       |\n| 3  | A       | 15       |\n| 4  | B       | 25       |\n<\/pre>\n<h3 id=\"sql-%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-VsfxqOkZTM\">SQL \u67e5\u8a62\u793a\u4f8b<\/h3>\n<p>\u6211\u5011\u5e0c\u671b\u5c07\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u6578\u91cf\u532f\u7e3d\u5230\u4e00\u884c\u4e2d\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre>\nSELECT \n    product,\n    SUM(CASE WHEN id = 1 THEN quantity ELSE 0 END) AS 'Sales_1',\n    SUM(CASE WHEN id = 2 THEN quantity ELSE 0 END) AS 'Sales_2',\n    SUM(CASE WHEN id = 3 THEN quantity ELSE 0 END) AS 'Sales_3',\n    SUM(CASE WHEN id = 4 THEN quantity ELSE 0 END) AS 'Sales_4'\nFROM \n    sales\nGROUP BY \n    product;\n<\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u6211\u5011\u5c07\u5f97\u5230\u4ee5\u4e0b\u7d50\u679c\uff1a<\/p>\n<pre>\n| product | Sales_1 | Sales_2 | Sales_3 | Sales_4 |\n|---------|---------|---------|---------|---------|\n| A       | 10      | 0       | 15      | 0       |\n| B       | 0       | 20      | 0       | 25      |\n<\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-VsfxqOkZTM\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u884c\u5217\u8f49\u63db\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u884c\u5217\u8f49\u63db\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u56e0\u6b64\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u78ba\u4fdd\u5728\u8f49\u63db\u904e\u7a0b\u4e2d\u4e0d\u6703\u4e1f\u5931\u4efb\u4f55\u91cd\u8981\u6578\u64da\uff0c\u4e26\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u53ef\u8b80\u6027\uff1a<\/strong>\u8f49\u63db\u5f8c\u7684\u6578\u64da\u61c9\u8a72\u6613\u65bc\u7406\u89e3\uff0c\u907f\u514d\u904e\u65bc\u8907\u96dc\u7684\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VsfxqOkZTM\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u7684\u884c\u5217\u8f49\u63db\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u8655\u7406\u6280\u8853\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u5206\u6790\u548c\u5c55\u793a\u6578\u64da\u3002\u901a\u904e\u9069\u7576\u7684 SQL \u67e5\u8a62\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u5c07\u4e00\u5217\u591a\u884c\u7684\u6578\u64da\u8f49\u63db\u70ba\u4e00\u884c\u591a\u5217\u7684\u683c\u5f0f\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u7528\u6027\u548c\u53ef\u8b80\u6027\u3002\u5728\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u6642\uff0c\u4e86\u89e3\u9019\u4e9b\u6280\u8853\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u60a8\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u884c\u5217\u8f49\u63db\u6280\u8853\uff0c\u5b78\u7fd2\u5982\u4f55\u5c07\u4e00\u5217\u591a\u884c\u6578\u64da\u8f49\u63db\u70ba\u4e00\u884c\u591a\u5217\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\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-187472","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187472","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=187472"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187472\/revisions"}],"predecessor-version":[{"id":187473,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187472\/revisions\/187473"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}