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The answer is once. Please look for documentation on correlated and non correlated subqueries. This should clear things up.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of hockchai Lim
Sent: Wednesday, March 02, 2011 1:02 PM
To: midrange-l@xxxxxxxxxxxx
Subject: sub-select in SQL
For the sql below, does any one know if the sub-select in the where
statement gets execute only once or it gets execute for each row in
BL1025INP file?
thanks
update
BL1025INP a
set
a.INERRFLG = 'Y'
where
a.inseq# in (
select inseq#
from BL1025INP b
where
b.inerrFlg = 'Y'
group by
INSEQ#)
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