From: Jean-Luc Lachance <jllachan@nsd.ca>
To: Albrecht Berger <berger1517@gmx.ch>
Cc: pgsql <pgsql-sql@postgresql.org>
Subject: Re: sql group by statement
Date: Fri, 13 Sep 2002 11:39:13 -0400
Message-ID: <3D8206A1.1B5B04FA@nsd.ca> (raw)
References: <002f01c25b10$6db4b940$a07ba8c0@wxp>
How about:
select * from <Table> where (id, val2) in ( select id, max(val2) from
<Table> group by id);
JLL
Albrecht Berger wrote:
>
> Hello,
> I have a problem, which I'm not able to solve with a simple query :
>
> I need a resultset with distinct id's, but the max val2 of each id.
> I tried to group by id, but though I need the pk in my resultset
> I have to group it too, which "destroys" the group of val2.
>
> Can this be done without a huge query ?
>
> Table :
> pk id val1 val2
> 1 1 2 3
> 2 1 2 4
> 3 2 1 1
> 4 1 0 5
> 5 2 1 8
>
>
> Needed Result :
> pk id val1 val2
> 4 1 0 5
> 5 2 1 8
>
>
> Thx
> berger
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: jllachan@nsd.ca, berger1517@gmx.ch
Subject: Re: sql group by statement
In-Reply-To: <3D8206A1.1B5B04FA@nsd.ca>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox