From: Simon Riggs <simon@2ndquadrant.com>
To: K C Lau <kclau60@netvigator.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: SELECT LIMIT 1 VIEW Performance Issue
Date: Fri, 23 Sep 2005 12:15:41 +0100
Message-ID: <1127474141.19345.10.camel@localhost.localdomain> (raw)
In-Reply-To: <6.2.1.2.0.20050922181009.02c36ca8@localhost>
References: <6.2.1.2.0.20050615100524.04f9d6a8@localhost>
<6.2.1.2.0.20050922102035.07bcf2e0@localhost>
<1127378456.4145.76.camel@localhost.localdomain>
<6.2.1.2.0.20050922181009.02c36ca8@localhost>
On Thu, 2005-09-22 at 18:40 +0800, K C Lau wrote:
> > > esdt=> explain analyze select PlayerID,AtDate from Player a
> > > where PlayerID='22220' and AtDate = (select b.AtDate from Player b
> > > where b.PlayerID = a.PlayerID order by b.PlayerID desc, b.AtDate desc
> > > LIMIT 1);
I think you should try:
select distinct on (PlayerID) PlayerID,AtDate from Player a
where PlayerID='22220' order by PlayerId, AtDate Desc;
Does that work for you?
Best Regards, Simon Riggs
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To: pgsql-performance@postgresql.org
Cc: simon@2ndquadrant.com, kclau60@netvigator.com
Subject: Re: SELECT LIMIT 1 VIEW Performance Issue
In-Reply-To: <1127474141.19345.10.camel@localhost.localdomain>
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