From: Don Drake <dondrake@gmail.com>
To: pgsql-sql@postgresql.org
Subject: plpgsql functions and NULLs
Date: Sun, 30 Jan 2005 13:41:28 -0600
Message-ID: <6c21003b0501301141234c256b@mail.gmail.com> (raw)
OK, I have a function that finds records that changed in a set of
tables and attempts to insert them into a data warehouse.
There's a large outer loop of candidate rows and I inspect them to see
if the values really changed before inserting.
My problem is that when I look to see if the row exists in the
warehouse already, based on some IDs, it fails when an ID is NULL.
The ID is nullable, so that's not a problem.
But I'm forced to write an IF statement looking for the potential NULL
and write 2 queries:
IF omcr_id is null
select * from ....
WHERE omcr_id is NULL
AND ...
ELSE
select * from ....
WHERE omcr_id=candidate.omcr_id
AND ....
END IF;
IF FOUND
...
Is there a way to do the lookup in one statement?? This could get ugly
quick. I'm using v7.4.
Thanks.
-Don
--
Donald Drake
President
Drake Consulting
http://www.drakeconsult.com/
312-560-1574
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To: pgsql-sql@postgresql.org
Cc: dondrake@gmail.com
Subject: Re: plpgsql functions and NULLs
In-Reply-To: <6c21003b0501301141234c256b@mail.gmail.com>
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