what is different between inline query,subquery& corelated
query?
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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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