Vincenzo Romano <vincenzo.romano@gmail.com> writes:
> Well, at least on v8.2.4 I cannot return count(*), that is the
> number of lines actually inserted into the table. Nor I can return
> any aggregate function of them.
> Am I doing anything wrong or is there some missing sentence in the
> documentation?

I would think the error message you get would make it pretty plain
that this wasn't just an oversight:

regression=# insert into int4_tbl default values returning count(*);
ERROR: cannot use aggregate function in RETURNING

RETURNING is supposed to return one row per inserted/deleted/updated
tuple, so what you suggest isn't sensible.

regards, tom lane

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