{"id":196201,"date":"2024-11-13T21:19:24","date_gmt":"2024-11-13T13:19:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196201\/"},"modified":"2024-11-13T21:19:25","modified_gmt":"2024-11-13T13:19:25","slug":"%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%ef%bc%9a%e4%b8%80%e5%9c%96%e7%9c%8b%e6%87%82%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196201\/","title":{"rendered":"\u638c\u63e1\u6578\u64da\u5eab\u805a\u5408\uff1a\u4e00\u5716\u770b\u61c2\u805a\u5408\u64cd\u4f5c (\u6578\u64da\u5eab\u805a\u5408\u793a\u610f\u5716)"},"content":{"rendered":"<h1 id=\"%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%ef%bc%9a%e4%b8%80%e5%9c%96%e7%9c%8b%e6%87%82%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%e7%a4%ba-SOdfujwlLM\">\u638c\u63e1\u6578\u64da\u5eab\u805a\u5408\uff1a\u4e00\u5716\u770b\u61c2\u805a\u5408\u64cd\u4f5c (\u6578\u64da\u5eab\u805a\u5408\u793a\u610f\u5716)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u805a\u5408\u64cd\u4f5c\u6210\u70ba\u4e86\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u7684\u91cd\u8981\u5de5\u5177\u3002\u805a\u5408\u64cd\u4f5c\u5141\u8a31\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u610f\u7fa9\u7684\u4fe1\u606f\uff0c\u4e26\u9032\u884c\u7d71\u8a08\u5206\u6790\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u805a\u5408\u7684\u6982\u5ff5\u3001\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\u4ee5\u53ca\u5982\u4f55\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%ef%bc%9f-SOdfujwlLM\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u805a\u5408\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u805a\u5408\u662f\u6307\u5c07\u591a\u689d\u8a18\u9304\u7684\u6578\u64da\u9032\u884c\u532f\u7e3d\uff0c\u4ee5\u751f\u6210\u66f4\u9ad8\u5c64\u6b21\u7684\u6578\u64da\u8996\u5716\u3002\u9019\u4e9b\u64cd\u4f5c\u901a\u5e38\u7528\u65bc\u8a08\u7b97\u7e3d\u548c\u3001\u5e73\u5747\u503c\u3001\u6700\u5927\u503c\u3001\u6700\u5c0f\u503c\u7b49\u7d71\u8a08\u6578\u64da\u3002\u805a\u5408\u64cd\u4f5c\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u548c\u5546\u696d\u667a\u80fd\u4e2d\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-SOdfujwlLM\">\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u805a\u5408\u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u805a\u5408\u64cd\u4f5c\u7684\u5de5\u5177\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>COUNT()<\/strong>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<li><strong>SUM()<\/strong>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u7e3d\u548c\u3002<\/li>\n<li><strong>AVG()<\/strong>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><strong>MAX()<\/strong>\uff1a\u627e\u51fa\u6578\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002<\/li>\n<li><strong>MIN()<\/strong>\uff1a\u627e\u51fa\u6578\u503c\u4e2d\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c%e7%9a%84%e7%a4%ba%e4%be%8b-SOdfujwlLM\">\u805a\u5408\u64cd\u4f5c\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SQL \u8a9e\u8a00\u9032\u884c\u805a\u5408\u64cd\u4f5c\u7684\u793a\u4f8b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\uff1a<\/p>\n<ul>\n<li><code>id<\/code>\uff1a\u92b7\u552e\u8a18\u9304\u7684\u552f\u4e00\u6a19\u8b58\u7b26<\/li>\n<li><code>amount<\/code>\uff1a\u92b7\u552e\u91d1\u984d<\/li>\n<li><code>date<\/code>\uff1a\u92b7\u552e\u65e5\u671f<\/li>\n<\/ul>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u8a08\u7b97\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales FROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>sales<\/code> \u8868\u4e2d\u6240\u6709\u92b7\u552e\u91d1\u984d\u7684\u7e3d\u548c\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>total_sales<\/code>\u3002<\/p>\n<h2 id=\"%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9c%96%e7%a4%ba%e8%a7%a3%e9%87%8b-SOdfujwlLM\">\u805a\u5408\u64cd\u4f5c\u7684\u5716\u793a\u89e3\u91cb<\/h2>\n<p>\u70ba\u4e86\u66f4\u597d\u5730\u7406\u89e3\u805a\u5408\u64cd\u4f5c\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u610f\u5716\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5f9e\u539f\u59cb\u6578\u64da\u4e2d\u9032\u884c\u805a\u5408\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/example.com\/aggregation-diagram.png\" alt=\"\u6578\u64da\u5eab\u805a\u5408\u793a\u610f\u5716\" \/><\/p>\n<p>\u5728\u9019\u500b\u793a\u610f\u5716\u4e2d\uff0c\u539f\u59cb\u6578\u64da\u88ab\u5206\u7d44\u4e26\u9032\u884c\u805a\u5408\uff0c\u6700\u7d42\u751f\u6210\u4e86\u66f4\u9ad8\u5c64\u6b21\u7684\u6578\u64da\u8996\u5716\u3002\u9019\u7a2e\u8996\u89ba\u5316\u7684\u65b9\u5f0f\u6709\u52a9\u65bc\u7528\u6236\u5feb\u901f\u7406\u89e3\u6578\u64da\u7684\u6574\u9ad4\u8da8\u52e2\u3002<\/p>\n<h2 id=\"%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-SOdfujwlLM\">\u805a\u5408\u64cd\u4f5c\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u805a\u5408\u64cd\u4f5c\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u5546\u696d\u5831\u544a<\/strong>\uff1a\u4f01\u696d\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u64cd\u4f5c\u4f86\u751f\u6210\u92b7\u552e\u5831\u544a\u3001\u8ca1\u52d9\u5831\u544a\u7b49\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u6790<\/strong>\uff1a\u6578\u64da\u5206\u6790\u5e2b\u53ef\u4ee5\u901a\u904e\u805a\u5408\u64cd\u4f5c\u4f86\u8b58\u5225\u6578\u64da\u4e2d\u7684\u8da8\u52e2\u548c\u6a21\u5f0f\u3002<\/li>\n<li><strong>\u696d\u52d9\u6c7a\u7b56<\/strong>\uff1a\u7ba1\u7406\u5c64\u53ef\u4ee5\u6839\u64da\u805a\u5408\u6578\u64da\u505a\u51fa\u66f4\u660e\u667a\u7684\u696d\u52d9\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-SOdfujwlLM\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u805a\u5408\u64cd\u4f5c\u662f\u6578\u64da\u5206\u6790\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u901a\u904e\u638c\u63e1\u805a\u5408\u51fd\u6578\u548c\u64cd\u4f5c\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u5206\u6790\uff0c\u4e26\u70ba\u696d\u52d9\u6c7a\u7b56\u63d0\u4f9b\u652f\u6301\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u63d0\u5347\u6578\u64da\u8655\u7406\u80fd\u529b\u7684\u95dc\u9375\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u6578\u64da\u5eab\u805a\u5408\u64cd\u4f5c\uff0c\u900f\u904e\u6e05\u6670\u793a\u610f\u5716\u8f15\u9b06\u7406\u89e3\u805a\u5408\u6982\u5ff5\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u8207\u7ba1\u7406\u80fd\u529b\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-196201","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196201","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=196201"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196201\/revisions"}],"predecessor-version":[{"id":196202,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196201\/revisions\/196202"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=196201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=196201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=196201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}