如何对每个类别的每个用户总计求和

Question

table preview

我有上表，我想总结每个类别的所有用户总数。用户1，用户2，...，用户20的总计将显示在表的末尾。我怎样才能在Joomla实现这一目标？

Answer 1

这将有效

SELECT `Category_ID` ,SUM( `user1` ) AS user1, SUM( `user1` ) AS user2 , ...
FROM `table_name`
GROUP BY `Category_ID`