Ühel kenal päeval, L, 2006-07-29 kell 18:25, kirjutas Martijn van
Oosterhout:
> On Sat, Jul 29, 2006 at 03:37:15AM +0300, Tzahi Fadida wrote:
> > Hi,
> > I have a query i am having trouble to formulate:
> > I used to do:
> > SELECT DISTINCT a0,a1 FROM public.t1
> > However, now i need to add the CTID attribute, but CTID is unique
> > thus, distinct is useless. In addition, i can't seem to be able to use max()
> > etc... or casting to anything on CTID in order to use group by technique.
>
> Use DISTINCT ON, see the docs for details.
>
> http://www.postgresql.org/docs/7.4/static/queries-select-lists.html
>
> That's for an older version, but it still works the same, google isn't
> delivering the newer version...
replace /7.4/ with /8.1/ to get a newer version ;)
> Have an nice day,
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