{"id":76274,"date":"2024-10-16T05:18:12","date_gmt":"2024-10-15T21:18:12","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76274\/"},"modified":"2024-10-16T05:18:12","modified_gmt":"2024-10-15T21:18:12","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b8%e8%bf%94%e5%9b%9e%e6%95%b8%e5%80%bc%e5%88%97%e7%9a%84%e7%b8%bd%e5%92%8c%e3%80%82","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76274\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528SUM()\u51fd\u6578\u8fd4\u56de\u6578\u503c\u5217\u7684\u7e3d\u548c\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b8%e8%bf%94%e5%9b%9e%e6%95%b8%e5%80%bc%e5%88%97%e7%9a%84%e7%b8%bd%e5%92%8c-XuxJKkzCrK\">MySQL\u5165\u9580\uff1a\u4f7f\u7528SUM()\u51fd\u6578\u8fd4\u56de\u6578\u503c\u5217\u7684\u7e3d\u548c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u975e\u5e38\u6d41\u884c\u7684\u9078\u64c7\uff0c\u56e0\u70ba\u5b83\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u7684\u529f\u80fd\u3002\u5c0d\u65bc\u521d\u5b78\u8005\u4f86\u8aaa\uff0c\u7406\u89e3\u5982\u4f55\u4f7f\u7528MySQL\u7684\u805a\u5408\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u51fd\u6578\u4e4b\u4e00\u5c31\u662fSUM()\u51fd\u6578\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528SUM()\u51fd\u6578\u4f86\u8a08\u7b97\u6578\u503c\u5217\u7684\u7e3d\u548c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u969b\u7684\u7bc4\u4f8b\u4f86\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e00\u6982\u5ff5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afsum%e5%87%bd%e6%95%b8%ef%bc%9f-XuxJKkzCrK\">\u4ec0\u9ebc\u662fSUM()\u51fd\u6578\uff1f<\/h2>\n<p>SUM()\u51fd\u6578\u662f\u4e00\u500b\u805a\u5408\u51fd\u6578\uff0c\u7528\u65bc\u8a08\u7b97\u6307\u5b9a\u5217\u4e2d\u6240\u6709\u6578\u503c\u7684\u7e3d\u548c\u3002\u9019\u500b\u51fd\u6578\u901a\u5e38\u8207SELECT\u8a9e\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u4e26\u4e14\u53ef\u4ee5\u8207GROUP BY\u5b50\u53e5\u7d50\u5408\uff0c\u4ee5\u4fbf\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u8a08\u7b97\u3002<\/p>\n<h2 id=\"sum%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-XuxJKkzCrK\">SUM()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\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\u60a8\u60f3\u8981\u8a08\u7b97\u7e3d\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=\"%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b8%e7%9a%84%e7%af%84%e4%be%8b-XuxJKkzCrK\">\u4f7f\u7528SUM()\u51fd\u6578\u7684\u7bc4\u4f8b<\/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\u7b26<\/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\u8981\u8a08\u7b97\u6240\u6709\u92b7\u552e\u91d1\u984d\u7684\u7e3d\u548c\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%a8sum%e5%87%bd%e6%95%b8%e8%88%87group-by%e5%ad%90%e5%8f%a5-XuxJKkzCrK\">\u4f7f\u7528SUM()\u51fd\u6578\u8207GROUP BY\u5b50\u53e5<\/h2>\n<p>\u7576\u6211\u5011\u9700\u8981\u6309\u67d0\u500b\u5217\u9032\u884c\u5206\u7d44\u8a08\u7b97\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528GROUP BY\u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u6309\u65e5\u671f\u8a08\u7b97\u6bcf\u5929\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\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\u4e14\u6bcf\u4e00\u884c\u90fd\u6703\u986f\u793a\u76f8\u61c9\u7684\u65e5\u671f\u548c\u8a72\u65e5\u671f\u7684\u92b7\u552e\u7e3d\u984d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-XuxJKkzCrK\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>SUM()\u51fd\u6578\u53ea\u6703\u8a08\u7b97\u6578\u503c\u578b\u7684\u5217\uff0c\u5c0d\u65bc\u975e\u6578\u503c\u578b\u7684\u5217\u5c07\u4e0d\u6703\u8fd4\u56de\u4efb\u4f55\u7d50\u679c\u3002<\/li>\n<li>\u5982\u679c\u5217\u4e2d\u5305\u542bNULL\u503c\uff0cSUM()\u51fd\u6578\u6703\u81ea\u52d5\u5ffd\u7565\u9019\u4e9bNULL\u503c\u3002<\/li>\n<li>\u5728\u4f7f\u7528GROUP BY\u6642\uff0c\u6240\u6709\u672a\u805a\u5408\u7684\u5217\u5fc5\u9808\u51fa\u73fe\u5728GROUP BY\u5b50\u53e5\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XuxJKkzCrK\">\u7e3d\u7d50<\/h2>\n<p>SUM()\u51fd\u6578\u662fMySQL\u4e2d\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u8a08\u7b97\u6578\u503c\u5217\u7684\u7e3d\u548c\u3002\u901a\u904e\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u9019\u500b\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5206\u6790\u548c\u8655\u7406\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u5546\u696d\u5831\u544a\u9084\u662f\u6578\u64da\u5206\u6790\u4e2d\uff0c\u638c\u63e1SUM()\u51fd\u6578\u90fd\u5c07\u70ba\u60a8\u63d0\u4f9b\u5f88\u5927\u7684\u5e6b\u52a9\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684MySQL\u6578\u64da\u5eab\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528SUM()\u51fd\u6578\u8a08\u7b97\u6578\u503c\u5217\u7684\u7e3d\u548c\uff0c\u638c\u63e1\u57fa\u672c\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u8655\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-76274","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76274","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=76274"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76274\/revisions"}],"predecessor-version":[{"id":76275,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76274\/revisions\/76275"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}