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Date: Mon, 17 Mar 2003 20:06:41 +0100
From: Tomasz Myrta <jasiek@klaster.net>
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To: "J.C.M. van der Kwast" <jkwast@home.nl>
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Subject: Re: Howto??
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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