Question

SELECT 
`loanac`.`id`, 
`loanac`.`name`, 
`loanac`.`lacc`, 
SUM(`loantrans`.`in`) as totalin, 
SUM(`loantrans`.`out`) as totalout

FROM loanac, loantrans
WHERE `loanac`.`lacc`=`loantrans`.`account`
GROUP BY `loanac`.`lacc`

以上是我上面的查询，可以正常显示所有帐户，但是我需要查找SUM（out）＆gt;的帐户SUM（in）而不是所有帐户

我尝试使用AND添加条件，但显示错误，有人可以帮忙吗？

Answer 1

对聚合函数（如SUM或COUNT）执行条件的方法是HAVING，而不是WHERE

SELECT loanac.id, loanac.name, loanac.lacc, loanac.phone, 
       SUM(loantrans.in) as totalin, SUM(loantrans.out) as totalout 
FROM loanac, 
     loantrans 
WHERE loanac.lacc=loantrans.account 
GROUP BY loanac.lacc
HAVING SUM(loantrans.out) > SUM(loantrans.in)

Answer 2

尝试使用

SELECT loanac.id, 
loanac.name, 
loanac.lacc, 
loanac.phone, 
SUM(loantrans.in) as totalin, 
SUM(loantrans.out) as totalout 
FROM loanac, loantrans 
WHERE loanac.lacc=loantrans.account 
GROUP BY loanac.lacc 
HAVING SUM(out) > SUM (in)

如何使用MySQL查询添加更多条件？

2 个答案: