Answer Posted / ramesh reddy veerabhadra

Basically Sub Query is Query within Query. There are different type of SubQuery.

1. Scalar Sub Query

Query that is totally independent from the main query.

select empno, (select count(*) from emp) total_emp
from emp


here the subquery is totally independent of the main query.

2. Corelated Sub Query

The sub query reffers to the main query.

select empno, (select deptname from dept d where e.deptno = d.deptno) deptname
from emp e


3. Inline view

A sub query that is used as a table or view in a SQL

select *
from (select empno, deptname
from emp e, dept d
where e.deptno = d.deptno)
where sal > 100

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