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Re: [GENERAL] JOIN exclusion problem

From: Peter Eisentraut <peter(at)pathwaynet(dot)com>
To: Anja Speerforck <anja(at)damn(dot)com>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] JOIN exclusion problem
Date: 1999-06-30 18:02:35
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Lists: pgsql-general
On Wed, 30 Jun 1999, Anja Speerforck wrote:

> Hello,
> I'm trying to join three tables, where I need only one piece of data from
> two of the tables.  The code I wrote is:
> SELECT apartner_nr, ap.anrede, ap.vorname, ap.nachname, ap.telefon, ap.fax,
>, ap.kunden_nr, k.name1, ap.agentur_nr, ag.name1 
> FROM ansprechpartner ap, kunden k, agenturen ag 
> WHERE ap.kunden_nr = k.kunden_nr OR ap.agentur_nr = ag.agentur_nr 
You might wanna try an AND there.

> ORDER BY nachname"
> The problem is that each row from each table is combined with each row of
> the other tables.  I know the code is wrong, but I don't know how to write
> it so that the results show only the actual value of ag.name1 and k.name1,
> and not all of the possible combinations.
> Is there a way of limiting how the rows are built up?  Pardon for novice
> nature of this question...

Peter Eisentraut
PathWay Computing

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