On Tue, Mar 29, 2005 at 14:21:15 +0100, T E Schmitz <mailreg@numerixtechnology.de> wrote:
>
> As far as I can see (via EXPLAIN), both DISTINCT and GROUP BY will lead
> to a sequentail scan. Is that correct?
If you need to read the whole table yes. However if you join the view
to something else that might not be necessary.
> If that's the case, I should come up with a different concept to obtain
> a list of ORIGINs.
That may be a good idea, especially if there are lots of rows for each
origin value.