[英]select specific column from subquery
My sample data with the Emp table 我的示例数据与Emp表
Emp
deptno eno
1 1
1 2
1 3
2 1
2 2
output: 输出:
deptno eno
1 3
2 2
out of this i need to have only one column in final output only 出于这一点,我只需要在最终输出中只有一列
deptno
1
2
I am trying to write 我正在写
select deptno from emp where deptno in (select deptno,max(eno)
from emp
group by deptno);
It is throwing error 它抛出错误
I'm thinking . 我在想 。 .
。 .
。
select distinct deptno
from emp;
Does that meet your needs? 满足您的需求吗?
Try this 尝试这个
select deptno from emp where deptno in (
select deptno from emp where eno in (
select MAX(eno) from emp))
select deptno
from emp
group by deptno
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