mysql - 此 sql 查询不起作用并显示错误 #1111Invalid use of group 函数

Question

SELECT reg.name,
       SUM(donatecheck.donate)
FROM   reg,
       donatecheck
WHERE  reg.email = donatecheck.email
       AND SUM(donatecheck.donate) > 4000
GROUP  BY reg.name; 

有两个表reg，donatecheck我想totaldonation从每个人的数据库中获取名称，并且不重复 ..donatecheck表attributes==email，和catagorydonationreg table==name,email

Answer 1

sum 之类的聚合函数不能在 WHERE 中使用，它们必须在 group by 中使用，使用 'HAVING' 关键字

SELECT reg.name,
       SUM(donatecheck.donate)
FROM   reg
       JOIN donatecheck
         ON reg.email = donatecheck.email
GROUP  BY reg.name
HAVING SUM(donatecheck.donate) > 4000;