The following more interesting example takes a single argument of type EMP, and retrieves multiple results:
select function hobbies (EMP) returns set of HOBBIES
as 'select (HOBBIES.all) from HOBBIES
where $1.name = HOBBIES.person'
language 'sql';
Should be:
create function hobbies (EMP) returns setof HOBBIES ...
It took me quite a while to figure out the second error, since "set of"
seemed perfectly natural there, when in fact it is "setof".
Thanks,
--Dan