| EXISTS [message #2157] |
Tue, 25 June 2002 03:36  |
Paramaguru
Messages: 4
Registered: June 2001
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Junior Member |
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What is the diff. between IN and EXISTS ?
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| Re: EXISTS [message #2158 is a reply to message #2157] |
Tue, 25 June 2002 03:57  |
ajay
Messages: 45
Registered: December 2000
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Member |
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IN is to check for a set of values
Select * from emp
where deptno in (select deptno from dept)
EXISTS is used for a correlated subquery to check the existence of any condition for the row in the outer query to considered for selection
Select * from emp e
Where exists (select 1 from deptno d
where d.deptno = e.deptno)
EXISTS is faster then IN
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