From: Tomasz Myrta <jasiek@klaster.net>
To: J.C.M. van der Kwast <jkwast@home.nl>
Cc: pgsql-sql@postgresql.org
Subject: Re: Howto??
Date: Mon, 17 Mar 2003 20:06:41 +0100
Message-ID: <3E761CC1.6000906@klaster.net> (raw)
In-Reply-To: <000801c2ec89$f70eeb60$04a779d9@cc299057a>
References: <000801c2ec89$f70eeb60$04a779d9@cc299057a>
Uz.ytkownik J.C.M. van der Kwast napisa?:
> Hi,
>
> After trying for a week now I've come to the conclusion that help is
> needed. I've got the following problem:
> I have a table with id column, another id (id2) column and a value
> column. For each id there can be more id2. I want id2 for id where the
> value is min. I tried several things with having but it doesn't produce
> what I need. Example:
>
> select id, id2, min(value) from table
> group by id
> having count (*) >1 and min(value) = (select min(value) from table)
>
> Now it complains about id2 not being part of aggregate.
> In order to get the min value I have to group by id, right? But because
> id2 is unique it won't do min on those values, right? So how do you
> tackle a problem like that? Any suggestions?
>
> thanks sjors
select distinct on(id) id2 from table
order by id,value;
Regards,
Tomasz Myrta
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To: pgsql-sql@postgresql.org
Cc: jasiek@klaster.net, jkwast@home.nl
Subject: Re: Howto??
In-Reply-To: <3E761CC1.6000906@klaster.net>
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