From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
---|---|
To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | sqllist <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Query Problem |
Date: | 2000-10-26 15:22:15 |
Message-ID: | Pine.BSF.4.10.10010260821280.26411-100000@megazone23.bigpanda.com |
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Lists: | pgsql-sql |
What is the explain output for the queries you've tried?
Stephan Szabo
sszabo(at)bigpanda(dot)com
On Wed, 25 Oct 2000, Josh Berkus wrote:
>
> 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
>
> --
> ______AGLIO DATABASE SOLUTIONS___________________________
> Josh Berkus
> Complete information technology josh(at)agliodbs(dot)com
> and data management solutions (415) 436-9166
> for law firms, small businesses fax 436-0137
> and non-profit organizations. pager 338-4078
> San Francisco
>
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