Issue with join condition while using in the corelated sub query

Question

Bees,
I am not able to use the below query since i have used a join condition in the corelated sub qery inline view.But i have a requirement like this . Please help me on this
select * from dept d
where exists (select 1 from (
select deptno
from emp where deptno= d.deptno)
Thank you
Boooo

Answer 1

Hi,
I've never seen a general solution for how to reference columns from main query a from sub-query c, where c is is sub-query of b, which is a sub-query of a.
Whenever I've wanted to, I've been able to get the desired results with a different approach.
In this case, you seem to want
SELECT     *
FROM     dept     d
WHERE     EXISTS     (
          SELECT     1
          FROM     emp
          WHERE     deptno     = d.deptno
          );I'm guessing at your data and desired output.