>
> SQL92 says:
> <direct select statement: multiple rows> ::=
> <query expression> [ <order by clause> ]
> [...]
> 3) Let T be the table specified by the <query expression>.
>
> 4) If ORDER BY is specified, then each <sort specification> in the
> <order by clause> shall identify a column of T.
>
Then it looks like postgres behaviour is still not compliant, if I read it correctly, because
select x from mytable order by y;
should be invalid according to this, but works just fine in postres.
Dima.
P.S. I think, this is a great feature actually (missed it a lot in informix), so, I hope, you guys won't start discussing how to fix it :-)