{"id":185302,"date":"2024-11-10T20:25:16","date_gmt":"2024-11-10T12:25:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185302\/"},"modified":"2024-11-10T20:25:17","modified_gmt":"2024-11-10T12:25:17","slug":"%e4%bd%bf%e7%94%a8sql%e8%aa%9e%e8%a8%80%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%b1%82%e5%92%8c%e5%8a%9f%e8%83%bd%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%b1%82%e5%92%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185302\/","title":{"rendered":"\u4f7f\u7528SQL\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u8868\u6c42\u548c\u529f\u80fd\uff08\u6578\u64da\u5eab\u8868\u6c42\u548c\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8sql%e8%aa%9e%e8%a8%80%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%b1%82%e5%92%8c%e5%8a%9f%e8%83%bd%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%b1%82%e5%92%8c-TFEnbTIjyV\">\u4f7f\u7528SQL\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u8868\u6c42\u548c\u529f\u80fd\uff08\u6578\u64da\u5eab\u8868\u6c42\u548c\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6c42\u548c\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u7d71\u8a08\u5206\u6790\u6642\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u6578\u64da\u5eab\u8868\u7684\u6c42\u548c\u529f\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u8a00\u4f86\u5be6\u73fe\u6578\u64da\u5eab\u8868\u7684\u6c42\u548c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"sql%e4%b8%ad%e7%9a%84sum%e5%87%bd%e6%95%b8-TFEnbTIjyV\">SQL\u4e2d\u7684SUM\u51fd\u6578<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u6c42\u548c\u51fd\u6578\u662fSUM()\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5c0d\u6307\u5b9a\u5217\u4e2d\u7684\u6578\u503c\u9032\u884c\u6c42\u548c\uff0c\u4e26\u8fd4\u56de\u7e3d\u548c\u3002\u4f7f\u7528SUM()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT SUM(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column_name<\/code>\u662f\u9700\u8981\u6c42\u548c\u7684\u5217\u540d\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800c<code>condition<\/code>\u5247\u662f\u53ef\u9078\u7684\u689d\u4ef6\uff0c\u7528\u65bc\u904e\u6ffe\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e8%a8%88%e7%ae%97%e9%8a%b7%e5%94%ae%e7%b8%bd%e9%a1%8d-TFEnbTIjyV\">\u793a\u4f8b\uff1a\u8a08\u7b97\u92b7\u552e\u7e3d\u984d<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>sales<\/code>\u7684\u6578\u64da\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li><code>id<\/code> &#8211; \u92b7\u552e\u8a18\u9304\u7684\u552f\u4e00\u6a19\u8b58<\/li>\n<li><code>amount<\/code> &#8211; \u92b7\u552e\u91d1\u984d<\/li>\n<li><code>date<\/code> &#8211; \u92b7\u552e\u65e5\u671f<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8a08\u7b97\u6240\u6709\u92b7\u552e\u8a18\u9304\u7684\u7e3d\u91d1\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales FROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u4e00\u500b\u540d\u70ba<code>total_sales<\/code>\u7684\u7d50\u679c\uff0c\u986f\u793a\u6240\u6709\u92b7\u552e\u91d1\u984d\u7684\u7e3d\u548c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8group-by%e9%80%b2%e8%a1%8c%e5%88%86%e7%b5%84%e6%b1%82%e5%92%8c-TFEnbTIjyV\">\u4f7f\u7528GROUP BY\u9032\u884c\u5206\u7d44\u6c42\u548c<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u6839\u64da\u67d0\u500b\u5217\u7684\u503c\u9032\u884c\u5206\u7d44\u6c42\u548c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u6309\u65e5\u671f\u8a08\u7b97\u6bcf\u65e5\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>GROUP BY<\/code>\u5b50\u53e5\uff1a<\/p>\n<pre><code>SELECT date, SUM(amount) AS daily_sales FROM sales GROUP BY date;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u4e00\u5929\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u4e26\u6309\u65e5\u671f\u9032\u884c\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8having%e9%81%8e%e6%bf%be%e5%88%86%e7%b5%84%e7%b5%90%e6%9e%9c-TFEnbTIjyV\">\u4f7f\u7528HAVING\u904e\u6ffe\u5206\u7d44\u7d50\u679c<\/h2>\n<p>\u5728\u4f7f\u7528<code>GROUP BY<\/code>\u9032\u884c\u5206\u7d44\u5f8c\uff0c\u6211\u5011\u53ef\u80fd\u5e0c\u671b\u904e\u6ffe\u67d0\u4e9b\u7d50\u679c\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528<code>HAVING<\/code>\u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u67e5\u770b\u92b7\u552e\u7e3d\u984d\u8d85\u904e1000\u7684\u65e5\u671f\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT date, SUM(amount) AS daily_sales FROM sales GROUP BY date HAVING SUM(amount) &gt; 1000;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u50c5\u8fd4\u56de\u90a3\u4e9b\u92b7\u552e\u7e3d\u984d\u8d85\u904e1000\u7684\u65e5\u671f\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-TFEnbTIjyV\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528SQL\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u8868\u7684\u6c42\u548c\u529f\u80fd\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u6280\u80fd\uff0c\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\u3002\u901a\u904e\u4f7f\u7528SUM()\u51fd\u6578\u3001GROUP BY\u548cHAVING\u5b50\u53e5\uff0c\u60a8\u53ef\u4ee5\u9748\u6d3b\u5730\u5c0d\u6578\u64da\u9032\u884c\u6c42\u548c\u548c\u904e\u6ffe\uff0c\u5f9e\u800c\u7372\u5f97\u6709\u50f9\u503c\u7684\u898b\u89e3\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662f\u9700\u8981\u9ad8\u6027\u80fd\u7684<a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\u9084\u662f\u7a69\u5b9a\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0cServer.HK\u90fd\u80fd\u63d0\u4f9b\u6eff\u8db3\u60a8\u9700\u6c42\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u8868\u7684\u6c42\u548c\u529f\u80fd\uff0c\u8f15\u9b06\u8a08\u7b97\u6578\u64da\u7e3d\u548c\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-185302","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185302","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=185302"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185302\/revisions"}],"predecessor-version":[{"id":185303,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185302\/revisions\/185303"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}