{"id":5759,"date":"2024-11-14T11:54:58","date_gmt":"2024-11-14T03:54:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5759\/"},"modified":"2024-11-14T11:54:58","modified_gmt":"2024-11-14T03:54:58","slug":"sql%e7%99%be%e5%88%86%e6%af%94%e6%80%8e%e4%b9%88%e6%98%be%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5759\/","title":{"rendered":"sql\u767e\u5206\u6bd4\u600e\u4e48\u663e\u793a"},"content":{"rendered":"<blockquote><p>\n  sql \u4e2d\u663e\u793a\u767e\u5206\u6bd4\u7684\u65b9\u6cd5\u6709\u4e09\u79cd\uff1a\u4f7f\u7528 format \u51fd\u6570\u3001concat \u51fd\u6570\u548c cast \u51fd\u6570\u3002format \u51fd\u6570\u4f7f\u7528 &#8216;p&#8217; \u6307\u5b9a\u767e\u5206\u6bd4\u683c\u5f0f\uff0cconcat \u51fd\u6570\u624b\u52a8\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7\uff0ccast \u51fd\u6570\u6307\u5b9a\u6570\u636e\u7c7b\u578b\u4e3a\u6570\u5b57\u5e76\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7\u3002\u4f8b\u5982\uff0cformat(sales \/ total_sales * 100, &#8216;p&#8217;) \u8fd4\u56de 30.00%\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/02\/2024060200515827378.jpg\" class=\"aligncenter\" title=\"sql\u767e\u5206\u6bd4\u600e\u4e48\u663e\u793a\u63d2\u56fe\" alt=\"sql\u767e\u5206\u6bd4\u600e\u4e48\u663e\u793a\u63d2\u56fe\" \/><\/p>\n<p><strong>SQL \u4e2d\u663e\u793a\u767e\u5206\u6bd4\u7684\u65b9\u6cd5<\/strong><\/p>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u663e\u793a\u767e\u5206\u6bd4\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528 FORMAT \u51fd\u6570<\/strong><\/p>\n<pre>SELECT FORMAT(value \/ total * 100, 'P') AS percentage\nFROM table_name;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ul>\n<li>value \u662f\u5206\u5b50\u7684\u503c<\/li>\n<li>total \u662f\u5206\u6bcd\u7684\u503c<\/li>\n<li>P \u6307\u5b9a\u683c\u5f0f\u4e3a\u767e\u5206\u6bd4<\/li>\n<\/ul>\n<p><strong>2. \u4f7f\u7528 CONCAT \u51fd\u6570<\/strong><\/p>\n<pre>SELECT CONCAT(value \/ total * 100, '%') AS percentage\nFROM table_name;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ul>\n<li>value \u662f\u5206\u5b50\u7684\u503c<\/li>\n<li>total \u662f\u5206\u6bcd\u7684\u503c<\/li>\n<li>% \u624b\u52a8\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7<\/li>\n<\/ul>\n<p><strong>3. \u4f7f\u7528 CAST \u51fd\u6570<\/strong><\/p>\n<pre>SELECT CAST(value \/ total * 100 AS NUMERIC(18, 2)) || '%' AS percentage\nFROM table_name;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ul>\n<li>value \u662f\u5206\u5b50\u7684\u503c<\/li>\n<li>total \u662f\u5206\u6bcd\u7684\u503c<\/li>\n<li>NUMERIC(18, 2) \u6307\u5b9a\u6570\u636e\u7c7b\u578b\u4e3a\u6570\u5b57\uff0c\u7cbe\u5ea6\u4e3a 18 \u4f4d\uff0c\u5c0f\u6570\u70b9\u540e\u4fdd\u7559 2 \u4f4d<\/li>\n<li>% \u624b\u52a8\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>SELECT FORMAT(sales \/ total_sales * 100, 'P') AS percentage\nFROM sales_data;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd4\u56de\u7ed3\u679c\uff1a<\/p>\n<pre>percentage\n----------\n30.00%\n40.00%\n30.00%<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\u767e\u5206\u6bd4\u600e\u4e48\u663e\u793a\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>sql \u4e2d\u663e\u793a\u767e\u5206\u6bd4\u7684\u65b9\u6cd5\u6709\u4e09\u79cd\uff1a\u4f7f\u7528 format \u51fd\u6570\u3001concat \u51fd\u6570\u548c cast \u51fd\u6570\u3002format \u51fd\u6570\u4f7f\u7528 &#8216;p&#8217; \u6307\u5b9a\u767e\u5206\u6bd4\u683c\u5f0f\uff0cconcat \u51fd\u6570\u624b\u52a8\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7\uff0ccast \u51fd\u6570\u6307\u5b9a\u6570\u636e\u7c7b\u578b\u4e3a\u6570\u5b57\u5e76\u6dfb\u52a0\u767e\u5206\u6bd4\u7b26\u53f7\u3002\u4f8b\u5982\uff0cformat(sales \/ total_sales * 100, &#8216;p&#8217;) \u8fd4\u56de 30.00%\u3002 SQL \u4e2d\u663e\u793a\u767e\u5206\u6bd4\u7684\u65b9\u6cd5 \u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u663e\u793a\u767e\u5206\u6bd4\uff1a 1. \u4f7f\u7528 FORMAT \u51fd\u6570 SELECT FORMAT(value \/ total * 100, &#8216;P&#8217;) AS percentage FROM table_name; \u767b\u5f55\u540e\u590d\u5236 value \u662f\u5206\u5b50\u7684\u503c total \u662f\u5206\u6bcd\u7684\u503c P \u6307\u5b9a\u683c\u5f0f\u4e3a\u767e\u5206\u6bd4 2. \u4f7f\u7528 CONCAT \u51fd\u6570 SELECT CONCAT(value \/ total * [&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-5759","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5759","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=5759"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5759\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}