Re: Formulating an sql query with CTID

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...

Have an nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.