From: JS Ubei <jsubei@yahoo.fr>
To: pgsql-performance@postgresql.org
Subject: optimize query with a maximum(date) extraction
Date: Wed, 5 Sep 2007 09:53:22 +0000 (GMT)
Message-ID: <302443.65402.qm@web26209.mail.ukl.yahoo.com> (raw)
Hi all,
I need to improve a query like :
SELECT id, min(the_date), max(the_date) FROM my_table GROUP BY id;
Stupidly, I create a B-tree index on my_table(the_date), witch is logically not used in my query, because it's not with a constant ? isn't it ?
I know that I can't create a function index with an aggregative function.
How I can do ?
thanks,
jsubei
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To: pgsql-performance@postgresql.org
Cc: jsubei@yahoo.fr
Subject: Re: optimize query with a maximum(date) extraction
In-Reply-To: <302443.65402.qm@web26209.mail.ukl.yahoo.com>
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