Re:

owner <ivan@psycho.pl> writes:
> i've CREATE FUNCTION iv_get(int) RETURNS SETOF same_table AS ' select *
> from same_table; ' LANGUAGE SQL;
> and then
> medyk=# SELECT * FROM iv_get(0);
> ERROR:  parser: parse error at or near "("

Works for me.  I suspect you are trying to use 7.3 features with a
pre-7.3 Postgres installation.

            regards, tom lane