HAVING 的参数必须是布尔类型，而不是整数类型

Question

我正在上 table 课程和列 place 和 cost 超过两行。

我希望我的查询显示费用最高的课程。我尝试使用以下查询

select splace 
from studies 
group by splace 
having max(ccost);

并得到错误 argument of HAVING must be type boolean, not type integer

我犯了什么错误？正确的查询是什么？

Answer 1

select  place
from    studies
where   cost = 
        (
        select  max(cost)
        from    studies
        )

Answer 2

如果你只想要一行，那么你可以使用limit和order by:

select place
from studies
order by cost desc
limit 1;

argument of HAVING must be type boolean, not type integer