From: James Cooper <jim@luckydigital.com>
To: sql <pgsql-sql@postgresql.org>
Subject: a change of query
Date: Wed, 26 Feb 2003 11:03:35 +1300
Message-ID: <004a01c2dd19$be6fe400$c900a8c0@jax> (raw)
select distinct cp.person_id from cluster_person cp, cluster c where cp.cluster_id = c.cluster_id and c.c_id = 1
can this query be changed to give just the row count?( of the distinct rows )
yes: i am aware of count() but this wont count the distinct rows - I can however achive this with an nested person_id in(select... etc but that slows things down big time!!!!
the above quey gives me my resultset asap - is there a way to get just the number of rows with the same speed
My thoughts are that I could just make a plpgsql function with a GET Diagniostics ROW_COUNT -
thoughts?
James
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To: pgsql-sql@postgresql.org
Cc: jim@luckydigital.com
Subject: Re: a change of query
In-Reply-To: <004a01c2dd19$be6fe400$c900a8c0@jax>
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