Re: sql group by statement - Mailing list pgsql-sql

From Jean-Luc Lachance
Subject Re: sql group by statement
Date
Msg-id 3D8206A1.1B5B04FA@nsd.ca
Whole thread Raw
In response to sql group by statement  ("Albrecht Berger" <berger1517@gmx.ch>)
List pgsql-sql
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


pgsql-sql by date:

Previous
From: "Florian Mader"
Date:
Subject: Timestamp Fractions Problem
Next
From: Jan Wieck
Date:
Subject: Re: Latitude / Longitude