{"id":5951,"date":"2024-11-14T11:46:17","date_gmt":"2024-11-14T03:46:17","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5951\/"},"modified":"2024-11-14T11:46:17","modified_gmt":"2024-11-14T03:46:17","slug":"sql%e5%a6%82%e4%bd%95%e8%ae%a1%e7%ae%97%e7%99%be%e5%88%86%e6%af%94","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5951\/","title":{"rendered":"sql\u5982\u4f55\u8ba1\u7b97\u767e\u5206\u6bd4"},"content":{"rendered":"<blockquote><p>\n  \u6709\u4e09\u79cd\u4e3b\u8981\u65b9\u6cd5\u53ef\u4ee5\u5229\u7528 sql \u8ba1\u7b97\u767e\u5206\u6bd4\uff1a\u76f4\u63a5\u8ba1\u7b97\u3001\u4f7f\u7528\u7a97\u53e3\u51fd\u6570\u4ee5\u53ca\u4f7f\u7528 case \u8868\u8fbe\u5f0f\u3002\u76f4\u63a5\u8ba1\u7b97\u901a\u8fc7\u5c06\u5206\u5b50\u9664\u4ee5\u5206\u6bcd\u5e76\u4e58\u4ee5 100 \u83b7\u5f97\u767e\u5206\u6bd4\uff1b\u7a97\u53e3\u51fd\u6570\u5141\u8bb8\u6839\u636e\u7ec4\u6309\u5206\u6bcd\u503c\u8ba1\u7b97\u767e\u5206\u6bd4\uff1b\u800c case \u8868\u8fbe\u5f0f\u5219\u53ef\u4f9d\u636e\u6761\u4ef6\u8ba1\u7b97\u4e0d\u540c\u7684\u767e\u5206\u6bd4\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/06\/2024060609153391896.jpg\" class=\"aligncenter\" title=\"sql\u5982\u4f55\u8ba1\u7b97\u767e\u5206\u6bd4\u63d2\u56fe\" alt=\"sql\u5982\u4f55\u8ba1\u7b97\u767e\u5206\u6bd4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 SQL \u8ba1\u7b97\u767e\u5206\u6bd4<\/strong><\/p>\n<p><strong>\u76f4\u63a5\u8ba1\u7b97<\/strong><\/p>\n<p>\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n<pre>Percentage = (numerator \/ denominator) * 100<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u8ba1\u7b97\u9500\u552e\u989d\u5360\u6536\u5165\u7684\u767e\u5206\u6bd4\uff1a<\/p>\n<pre>Sales_Percentage = (Sales \/ Revenue) * 100<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u4f7f\u7528\u7a97\u53e3\u51fd\u6570<\/strong><\/p>\n<p>\u7a97\u53e3\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u5728\u6309\u7ec4\u8ba1\u7b97\u767e\u5206\u6bd4\u65f6\u4f7f\u7528\u5206\u6bcd\u503c\u3002OVER \u5b50\u53e5\u6307\u5b9a\u8ba1\u7b97\u7684\u8303\u56f4\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528 ROW_NUMBER() \u51fd\u6570\u4e3a\u6bcf\u4e2a\u90e8\u95e8\u8ba1\u7b97\u9500\u552e\u989d\u5728\u603b\u9500\u552e\u989d\u4e2d\u6240\u5360\u7684\u767e\u5206\u6bd4\uff1a<\/p>\n<pre>SELECT Department,\n       Sales,\n       SUM(Sales) OVER() AS TotalSales,\n       (Sales \/ TotalSales) * 100 AS Sales_Percentage\nFROM Sales\nGROUP BY Department<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u4f7f\u7528 CASE \u8868\u8fbe\u5f0f<\/strong><\/p>\n<p>CASE \u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u6765\u6839\u636e\u6761\u4ef6\u8ba1\u7b97\u4e0d\u540c\u7684\u767e\u5206\u6bd4\u3002\u4f8b\u5982\uff0c\u6839\u636e\u5ba2\u6237\u7c7b\u578b\u8ba1\u7b97\u6298\u6263\u767e\u5206\u6bd4\uff1a<\/p>\n<pre>SELECT CustomerType,\n       CASE\n           WHEN CustomerType = 'Gold' THEN 0.1\n           WHEN CustomerType = 'Silver' THEN 0.05\n           ELSE 0\n       END AS Discount_Percentage\nFROM Customers<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u786e\u4fdd\u5206\u6bcd\u4e0d\u4e3a\u96f6\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u9664\u96f6\u9519\u8bef\u3002<\/li>\n<li>\u6839\u636e\u9700\u8981\u5bf9\u8ba1\u7b97\u7ed3\u679c\u8fdb\u884c\u820d\u5165\u6216\u622a\u65ad\u3002<\/li>\n<li>\u4f7f\u7528\u9002\u5f53\u7684\u522b\u540d\u4e3a\u767e\u5206\u6bd4\u5217\uff0c\u4ee5\u4fbf\u4e8e\u8bc6\u522b\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\u5982\u4f55\u8ba1\u7b97\u767e\u5206\u6bd4\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u4e09\u79cd\u4e3b\u8981\u65b9\u6cd5\u53ef\u4ee5\u5229\u7528 sql \u8ba1\u7b97\u767e\u5206\u6bd4\uff1a\u76f4\u63a5\u8ba1\u7b97\u3001\u4f7f\u7528\u7a97\u53e3\u51fd\u6570\u4ee5\u53ca\u4f7f\u7528 case \u8868\u8fbe\u5f0f\u3002\u76f4\u63a5\u8ba1\u7b97\u901a\u8fc7\u5c06\u5206\u5b50\u9664\u4ee5\u5206\u6bcd\u5e76\u4e58\u4ee5 100 \u83b7\u5f97\u767e\u5206\u6bd4\uff1b\u7a97\u53e3\u51fd\u6570\u5141\u8bb8\u6839\u636e\u7ec4\u6309\u5206\u6bcd\u503c\u8ba1\u7b97\u767e\u5206\u6bd4\uff1b\u800c case \u8868\u8fbe\u5f0f\u5219\u53ef\u4f9d\u636e\u6761\u4ef6\u8ba1\u7b97\u4e0d\u540c\u7684\u767e\u5206\u6bd4\u3002 \u5982\u4f55\u4f7f\u7528 SQL \u8ba1\u7b97\u767e\u5206\u6bd4 \u76f4\u63a5\u8ba1\u7b97 \u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a Percentage = (numerator \/ denominator) * 100 \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u8981\u8ba1\u7b97\u9500\u552e\u989d\u5360\u6536\u5165\u7684\u767e\u5206\u6bd4\uff1a Sales_Percentage = (Sales \/ Revenue) * 100 \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u7a97\u53e3\u51fd\u6570 \u7a97\u53e3\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u5728\u6309\u7ec4\u8ba1\u7b97\u767e\u5206\u6bd4\u65f6\u4f7f\u7528\u5206\u6bcd\u503c\u3002OVER \u5b50\u53e5\u6307\u5b9a\u8ba1\u7b97\u7684\u8303\u56f4\u3002 \u4f8b\u5982\uff0c\u4f7f\u7528 ROW_NUMBER() \u51fd\u6570\u4e3a\u6bcf\u4e2a\u90e8\u95e8\u8ba1\u7b97\u9500\u552e\u989d\u5728\u603b\u9500\u552e\u989d\u4e2d\u6240\u5360\u7684\u767e\u5206\u6bd4\uff1a SELECT Department, Sales, SUM(Sales) OVER() AS TotalSales, (Sales \/ TotalSales) * 100 AS Sales_Percentage FROM Sales GROUP BY [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5951","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5951"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5951\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}