{"id":217815,"date":"2023-12-23T00:43:27","date_gmt":"2023-12-22T16:43:27","guid":{"rendered":"https:\/\/www.idc.net\/help\/217815\/"},"modified":"2023-12-23T00:43:27","modified_gmt":"2023-12-22T16:43:27","slug":"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e6%80%bb%e5%92%8c","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217815\/","title":{"rendered":"MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528SUM()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u603b\u548c"},"content":{"rendered":"<p><title id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e6%80%bb%e5%92%8c-rXMInrvdXP\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528SUM()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u603b\u548c<\/title><\/p>\n<h1 id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8sum%e5%87%bd%e6%95%b0%e8%bf%94%e5%9b%9e%e6%95%b0%e5%80%bc%e5%88%97%e7%9a%84%e6%80%bb%e5%92%8c-rXMInrvdXP\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528SUM()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u603b\u548c<\/h1>\n<p>\u5728MySQL\u4e2d\uff0cSUM()\u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u6570\u503c\u5217\u7684\u603b\u548c\u3002\u5b83\u53ef\u4ee5\u7528\u4e8e\u6574\u6570\u3001\u5c0f\u6570\u6216\u5176\u4ed6\u6570\u503c\u7c7b\u578b\u7684\u5217\u3002<\/p>\n<h2 id=\"%e8%af%ad%e6%b3%95-rXMInrvdXP\">\u8bed\u6cd5<\/h2>\n<p>SUM()\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SUM(column_name)\n<\/code><\/pre>\n<p>\u5176\u4e2d\uff0ccolumn_name\u662f\u8981\u8ba1\u7b97\u603b\u548c\u7684\u5217\u7684\u540d\u79f0\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-rXMInrvdXP\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3aorders\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u8ba2\u5355\u7684\u4fe1\u606f\uff0c\u5305\u62ec\u8ba2\u5355\u53f7\u3001\u4ea7\u54c1\u540d\u79f0\u548c\u4ea7\u54c1\u6570\u91cf\u3002\u6211\u4eec\u60f3\u8981\u8ba1\u7b97\u6240\u6709\u8ba2\u5355\u7684\u4ea7\u54c1\u6570\u91cf\u7684\u603b\u548c\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u8fd9\u4e2a\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE orders (\n    order_id INT,\n    product_name VARCHAR(50),\n    quantity INT\n);\n<\/code><\/pre>\n<p>\u7136\u540e\uff0c\u6211\u4eec\u5411\u8868\u4e2d\u63d2\u5165\u4e00\u4e9b\u6570\u636e\uff1a<\/p>\n<pre><code>INSERT INTO orders (order_id, product_name, quantity)\nVALUES (1, 'Product A', 10),\n       (2, 'Product B', 5),\n       (3, 'Product C', 8);\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528SUM()\u51fd\u6570\u6765\u8ba1\u7b97\u6240\u6709\u8ba2\u5355\u7684\u4ea7\u54c1\u6570\u91cf\u7684\u603b\u548c\uff1a<\/p>\n<pre><code>SELECT SUM(quantity) AS total_quantity\nFROM orders;\n<\/code><\/pre>\n<p>\u8fd0\u884c\u4ee5\u4e0a\u67e5\u8be2\uff0c\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n<pre><code>+----------------+\n| total_quantity |\n+----------------+\n|             23 |\n+----------------+\n<\/code><\/pre>\n<p>\u8fd9\u8868\u793a\u6240\u6709\u8ba2\u5355\u7684\u4ea7\u54c1\u6570\u91cf\u7684\u603b\u548c\u4e3a23\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9-rXMInrvdXP\">\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u5728\u4f7f\u7528SUM()\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>SUM()\u51fd\u6570\u53ea\u80fd\u7528\u4e8e\u6570\u503c\u5217\uff0c\u4e0d\u80fd\u7528\u4e8e\u975e\u6570\u503c\u5217\u3002<\/li>\n<li>\u5982\u679c\u5217\u4e2d\u5305\u542bNULL\u503c\uff0cSUM()\u51fd\u6570\u5c06\u5ffd\u7565\u8fd9\u4e9bNULL\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%80%bb%e7%bb%93-rXMInrvdXP\">\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528SUM()\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8ba1\u7b97\u6570\u503c\u5217\u7684\u603b\u548c\u3002\u5728MySQL\u4e2d\uff0cSUM()\u51fd\u6570\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u805a\u5408\u51fd\u6570\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8fdb\u884c\u5404\u79cd\u7edf\u8ba1\u8ba1\u7b97\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u53ef\u9760\u7684\u4e91\u8ba1\u7b97\u670d\u52a1\u63d0\u4f9b\u5546\uff0c\u540e\u6d6a\u4e91\u662f\u60a8\u7684\u9996\u9009\u3002\u6211\u4eec\u63d0\u4f9b\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u7b49\u591a\u79cd\u4ea7\u54c1\uff0c\u4ee5\u6ee1\u8db3\u4e0d\u540c\u7528\u6237\u7684\u9700\u6c42\u3002\u60a8\u53ef\u4ee5\u8bbf\u95ee\u6211\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528SUM()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u603b\u548c MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528SUM()\u51fd\u6570\u8fd4\u56de\u6570\u503c\u5217\u7684\u603b\u548c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197851],"tags":[],"class_list":["post-217815","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=217815"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217815\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}