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May I suggest that in your exists clause that you select something other than *, for example '1'. Using * makes that query examine all the fields in the file so why do that when you just looking for existences.
Another option is to not do the exists at all and use COALESCE around the select in the set clause. If the result of the select is null and you coalesce it to zero, what would you actually be changing? Nothing because the where clause is saying only select where the field equaled 0.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Morgan, Paul
Sent: Friday, September 24, 2010 11:41 AM
To: Midrange Systems Technical Discussion
Subject: RE: Update One File from Another with SQL
Bob,
Update b
set b.stduc = ( select a.ucdef
from a
where a.ucdef > 0
and a.itnbr = b.itnbr )
where b.stduc = 0
and exists( select *
from a
where a.ucdef > 0
and a.itnbr = b.itnbr )
Paul
Principal Programmer Analyst
IS Supply Chain/Replenishment
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Bob Voltz
Sent: Friday, September 24, 2010 11:06 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Update One File from Another with SQL
I want to update File B with data from File A.
There is a one-to-one relationship based on Item Number.
Pseudocode:
IF A.UCDEF > 0 AND B.STDUC = 0 AND A.ITNBR = B.ITNBR THEN LET B.STDUC =
A.UCDEF
How is this accomplished with SQL?
Thanks,
Bob Voltz
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