{"id":181282,"date":"2024-11-09T15:45:18","date_gmt":"2024-11-09T07:45:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/181282\/"},"modified":"2024-11-09T15:45:19","modified_gmt":"2024-11-09T07:45:19","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e5%92%8c%e5%88%86%e7%b5%84%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/181282\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff08\u6578\u64da\u5eab\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\uff09"},"content":{"rendered":"<h1 id=\"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e5%92%8c%e5%88%86%e7%b5%84%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-aKNyDcjLoN\">\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u662f\u5206\u6790\u548c\u8655\u7406\u6578\u64da\u7684\u91cd\u8981\u5de5\u5177\u3002\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\uff0c\u9032\u800c\u652f\u6301\u6c7a\u7b56\u904e\u7a0b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e9b\u51fd\u6578\u7684\u5b9a\u7fa9\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%ef%bc%9f-aKNyDcjLoN\">\u4ec0\u9ebc\u662f\u805a\u5408\u51fd\u6578\uff1f<\/h2>\n<p>\u805a\u5408\u51fd\u6578\u662f\u5c0d\u4e00\u7d44\u503c\u9032\u884c\u8a08\u7b97\u4e26\u8fd4\u56de\u55ae\u4e00\u503c\u7684\u51fd\u6578\u3002\u9019\u4e9b\u51fd\u6578\u901a\u5e38\u7528\u65bc\u6578\u64da\u5206\u6790\u4e2d\uff0c\u4ee5\u4fbf\u5f9e\u591a\u689d\u8a18\u9304\u4e2d\u63d0\u53d6\u7d71\u8a08\u4fe1\u606f\u3002\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>COUNT()<\/code>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<li><code>SUM()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>MIN()<\/code>\uff1a\u8fd4\u56de\u6700\u5c0f\u503c\u3002<\/li>\n<li><code>MAX()<\/code>\uff1a\u8fd4\u56de\u6700\u5927\u503c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-aKNyDcjLoN\">\u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u805a\u5408\u51fd\u6578\u7684\u7c21\u55ae\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b <code>amount<\/code> \u6b04\u4f4d\uff0c\u8a18\u9304\u4e86\u6bcf\u7b46\u92b7\u552e\u7684\u91d1\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\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=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%88%86%e7%b5%84%e5%87%bd%e6%95%b8%ef%bc%9f-aKNyDcjLoN\">\u4ec0\u9ebc\u662f\u5206\u7d44\u51fd\u6578\uff1f<\/h2>\n<p>\u5206\u7d44\u51fd\u6578\u901a\u5e38\u8207\u805a\u5408\u51fd\u6578\u4e00\u8d77\u4f7f\u7528\uff0c\u76ee\u7684\u662f\u5c07\u6578\u64da\u5206\u7d44\u4e26\u5c0d\u6bcf\u500b\u7d44\u9032\u884c\u805a\u5408\u8a08\u7b97\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u5206\u985e\u4e0b\u7372\u5f97\u7d71\u8a08\u4fe1\u606f\u3002\u5206\u7d44\u51fd\u6578\u7684\u95dc\u9375\u5b57\u662f <code>GROUP BY<\/code>\u3002<\/p>\n<h3 id=\"%e5%88%86%e7%b5%84%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-aKNyDcjLoN\">\u5206\u7d44\u51fd\u6578\u7684\u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u6839\u64da <code>category<\/code> \u6b04\u4f4d\u4f86\u8a08\u7b97\u6bcf\u500b\u985e\u5225\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT category, SUM(amount) AS total_sales \nFROM sales \nGROUP BY category;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u985e\u5225\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u4e26\u5c07\u7d50\u679c\u6309\u985e\u5225\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e5%92%8c%e5%88%86%e7%b5%84%e5%87%bd%e6%95%b8%e7%9a%84%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-aKNyDcjLoN\">\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u7d93\u5e38\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u66f4\u5177\u9ad4\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6bcf\u500b\u985e\u5225\u7684\u5e73\u5747\u92b7\u552e\u91d1\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT category, AVG(amount) AS average_sales \nFROM sales \nGROUP BY category;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u985e\u5225\u7684\u5e73\u5747\u92b7\u552e\u91d1\u984d\uff0c\u5e6b\u52a9\u4f01\u696d\u4e86\u89e3\u4e0d\u540c\u985e\u5225\u7684\u8868\u73fe\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-aKNyDcjLoN\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728 <code>SELECT<\/code> \u8a9e\u53e5\u4e2d\uff0c\u6240\u6709\u672a\u4f7f\u7528\u805a\u5408\u51fd\u6578\u7684\u6b04\u4f4d\u5fc5\u9808\u51fa\u73fe\u5728 <code>GROUP BY<\/code> \u5b50\u53e5\u4e2d\u3002<\/li>\n<li>\u805a\u5408\u51fd\u6578\u7684\u8a08\u7b97\u662f\u57fa\u65bc\u5206\u7d44\u5f8c\u7684\u6578\u64da\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u6642\u9700\u78ba\u4fdd\u5206\u7d44\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u805a\u5408\u548c\u5206\u7d44\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u9032\u884c\u512a\u5316\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-aKNyDcjLoN\">\u7e3d\u7d50<\/h2>\n<p>\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u662f\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u4f01\u696d\u53ef\u4ee5\u66f4\u597d\u5730\u5206\u6790\u6578\u64da\uff0c\u652f\u6301\u6c7a\u7b56\u904e\u7a0b\u3002\u82e5\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u4e86\u89e3\u6578\u64da\u5eab\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\uff0c\u512a\u5316\u67e5\u8a62\u6548\u7387\uff0c\u5be6\u73fe\u7cbe\u6e96\u6578\u64da\u8655\u7406\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-181282","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181282","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=181282"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181282\/revisions"}],"predecessor-version":[{"id":181283,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181282\/revisions\/181283"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=181282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=181282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=181282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}