Обсуждение: Antw: GROUP by

Antti Linno <alligator@all.ee> wrote:

> I have table job, and I want to select data from it, grouping by
> workgroups. When I use 
>  select id,name from job where workgroup='top leaders' AND ...  group by
> workgroup;
> When I want to group, I get 
> ERROR:  Illegal use of aggregates or non-group column in target list
> I'm confused, why does query work only with sum,min etc. alone in
> select.
> 
> Antti

You can use GROUP BY only in conjunction with aggregat functions. Then you have to gruop by all attributes in the
targetlist, that are not aggregated.
 

Example:
select id,name, workgroup, count(*) 
from job 
where workgroup='top leaders' AND ...  
group by id,name,workgroup;

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Gerhard