mysql - 在having 子句中使用运算符。错误

Question

set @mte := (select max(salary * months) from employee);

select count(name), salary*months
from employee
group by salary*months
having salary*months = @mte;

编译时出现错误

ERROR 1054 (42S22) at line 12: Unknown column 'salary' in 'having clause' P.S: Woud like to use having clause instead of where. I'm learning through experimenting. Would like to know why this doesn't works P.S: USING MYSQL LATEST

Answer 1

尝试在此处使用交叉应用并用 where 子句替换having:

set @mte := (select max(salary * months) from employee);

select count(name), SalMonth
from employee cross apply (select salary*months SalMonth)a
where SalMonth = @mte
group by SalMonth;