From: Chad Thompson <chad@weblinkservices.com>
To: James Cooper <jim@luckydigital.com>
To: sql <pgsql-sql@postgresql.org>
Subject: Re: a change of query
Date: Tue, 25 Feb 2003 15:40:41 -0700
Message-ID: <06eb01c2dd1e$ee5488b0$32021aac@chad> (raw)
References: <004a01c2dd19$be6fe400$c900a8c0@jax>
how about
select count(distinct cp.person_id) from cluster_person cp, cluster c where cp.cluster_id = c.cluster_id and c.c_id = 1
Is that as fast?
Chad
----- Original Message -----
From: James Cooper
To: sql
Sent: Tuesday, February 25, 2003 3:03 PM
Subject: [SQL] a change of query
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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Cc: chad@weblinkservices.com, jim@luckydigital.com
Subject: Re: a change of query
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