"Alain TESIO" <tesio(at)easynet(dot)fr> writes:
> dip=> select x,min(y) from t group by x;
> x|min
> -+---
> |
> (1 row)
Yup, that's a bug --- with GROUP BY, no rows in should yield no groups
and hence no rows out. It's fixed for the next release.
regards, tom lane