From: Josh Berkus <josh@agliodbs.com>
To: sqllist <pgsql-sql@postgresql.org>
Subject: Query Problem
Date: Wed, 25 Oct 2000 18:59:03 -0700
Message-ID: <39F78FE7.DA915769@agliodbs.com> (raw)
Folks:
Here's the problem, in abstract: I need to select every record in table
A that does not have a link in table B Join Table C where Table
C.account = 11
The relevant fields:
Table_A
CaseID
Data
Table_B
GroupID
CaseID
Amount
Table_C
GroupID
AccountID
Thus, I need to select:
SELECT Data FROM Table A
WHERE CaseID NOT IN (
SELECT CaseID FROM Table_B, Table_C
WHERE Table_B.GroupID = TableC.GroupID
AND TableC.AccountID = 11)
The problem is, since Table_B and Table_C are large (10,000 records +)
this exclusion query takes several *minutes* to run.
I've fooled around with drectional joins, views, and temporary tables,
but I can seem to find anything that works faster. Suggestions?
-Josh Berkus
--
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To: pgsql-sql@postgresql.org
Cc: josh@agliodbs.com
Subject: Re: Query Problem
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