Re: returns 0 row from plpgsql function

2010/3/20 zhong ming wu <mr(dot)z(dot)m(dot)wu(at)gmail(dot)com>:
> Dear List
>
> I use plpgsql function as a postfix mailserver look-up table.  For
> example to look up virtual email address.
> If I don't host this email address, then the function returns null.
> Because it's a 1 row of null value postfix logs a warning message.
> Although it's harmless in that postfix takes no further action to
> deliver mail, these warning messages fill up log table.
>
> How can I return 0 row from plpgsql function?

create or replace function func(...)
returns setof tablename as $$
begin
return;
end;
$$ language plpgsql;

select * from func(..);

regards
Pavel Stehule
>
> Thanks
>
> mr.wu
>
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