On Sun, Dec 19, 2004 at 15:02:27 +0200,
Ciprian Popovici <ciprian@zuavra.net> wrote:
> On Sat, 18 Dec 2004 11:07:37 -0600 Bruno Wolff III <bruno@wolff.to> wrote:
> > On Fri, Dec 17, 2004 at 11:10:12 -0000,
> > Filip Wuytack <fwuytack@fgscapital.com> wrote:
> > > Is it possible to have a sequence (as a multirow prim key), where
> > > sequence (id) only increase per group of data (grp).
> >
> > Why do you want to do this? It would be a lot simpler to generate unique
> > values over the table and that will work just fine if all you need
> > is uniqueness.
>
> Here's a case where what he said would come in handy: arranging a
> particular display order within the individual groups. You have the unique
> key for the entire table, but you need something like a serial restricted
> to just a group of rows.
You wouldn't want to use a serial type for that. Inserts would become a big
pain. You can use numeric or text so that it is easy to do inserts.