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From: Richard Broersma Jr <rabroersma@yahoo.com>
To: Leif B. Kristensen <leif@solumslekt.org>
To: pgsql-sql@postgresql.org
Subject: Re: Finding multiple events of the same kind
Date: Sun, 11 Jun 2006 11:36:39 -0700 (PDT)
Message-ID: <20060611183639.19893.qmail@web31810.mail.mud.yahoo.com> (raw)
In-Reply-To: <200606111534.17393.leif@solumslekt.org>

> On Sunday 11. June 2006 15:27, Frank Bax wrote:
> >SELECT participants.person_fk, count(participants.person_fk) FROM
> > events, participants
> >    WHERE events.event_id = participants.event_fk
> >         AND events.tag_fk in (2,62,1035)
> >    GROUP BY participants.person_fk HAVING
> > count(participants.person_fk) > 1
> 
> That worked like a charm! Thank you very much!
> -- 

Also,  you could create a unique column constraint that would prevent multiply instances of the
same person in the participants table.

Regards,

Richard Broersma Jr.

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