Re: Is it possible to make the order of output the same as the order of input parameters?

On Wed, Jun 02, 2010 at 04:47:01PM +0200, A. Kretschmer wrote:
> In response to Sam Mason :
> >   SELECT c.*
> >   FROM customer c, (
> >     SELECT *, row_number() OVER ()
> >     FROM (VALUES (23), (56), (2), (12), (10)) x) x(val,ord)
> >   WHERE c.id = x.val
> >   ORDER BY x.ord;
>
> Wow, that's really cool and a nice case for row_number().

Just thinking about it now; do SQL's semantics say it'll always do
the right thing?  PG does in a couple of quick tests (i.e. one where
customer is a small table and PG prefers a seqscan and where it's larger
and prefers an index scan) but I'm not sure if this could change.

--
  Sam  http://samason.me.uk/