Re: Can this query be optimized?

From: Claus Heiko Niesen <cniesen(at)gmx(dot)net>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: Can this query be optimized?
Date: 2001-11-08 19:11:34
Message-ID: 5.1.0.14.2.20011108093538.00ae2858@pop.gmx.net
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Ooops, I posted one test SQL statements which really didn't make
sense. This is the correct one:

select distinct extract(year from date) as year, extract(month from date)
as month from week_pics order by year desc, month desc;

I try to get a list of all the months that have a picture. So the day part
of the date should be ignored.

Claus

At 08:30 AM 11/08/2001, Tom wrote:
>Claus Heiko Niesen <cniesen(at)gmx(dot)net> writes:
> > I'm stuck optimizing the following query:
> > select distinct extract(year from date) as year, extract(month from date)
> > as month, date from week_pics order by date desc;
>
>Perhaps it would work to forget the "distinct" and instead GROUP BY
>date.
>
> regards, tom lane

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