What is best to use

I have a concern:
if I need to evaluate in my where condition, what is best, use IN operator or use EXISTS operator.
If in both cases I need to evaluate columna A versus select results....
Thank you

Hi
select ...
from ...
where columnA in (select cola from ...)
or
select ...
from ...
where exists (select 1 from ... where cola = columnA)
I think these version are equal, but if you need the best execution plan use join instead of IN and EXISTS.
Ott Karesz
http.//www.trendo-kft.hu

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