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To: Andreas Joseph Krogh <andreak@officenet.no>
cc: pgsql-sql@postgresql.org, "Premsun Choltanwanich" <Premsun@nsasia.co.th>
Subject: Re: Slow Query problem 
In-reply-to: <200801281326.33832.andreak@officenet.no> 
References: <479DE418.C5F7.004C.0@nsasia.co.th>
	<200801281326.33832.andreak@officenet.no>
Comments: In-reply-to Andreas Joseph Krogh <andreak@officenet.no>
	message dated "Mon, 28 Jan 2008 13:26:33 +0100"
Date: Mon, 28 Jan 2008 12:20:06 -0500
Message-ID: <3741.1201540806@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Andreas Joseph Krogh <andreak@officenet.no> writes:
> On Monday 28 January 2008 08:18:24 Premsun Choltanwanich wrote:
>> I am currently using PostgreSQL database version 8.0.13.  My problem
>> relates to a slow result when a query using a defined view joins to another
>> table for a result.

> It is very hard to help without you providing the schema for the tables/views
> involved.

One suggestion is that 8.2.x is significantly smarter about joins to
unions than previous releases were.  Whether this would help in your
particular case is impossible to say, though, without more detail.

			regards, tom lane