Re: something simple but I can't

On 2011-01-29, John Fabiani <johnf(at)jfcomputer(dot)com> wrote:
> Hi guys,
> I trying to return a 0.00 from a function it there are no records found else
> return the amount.

> select sum(aropen_paid) into _paidamt FROM public.aropen where
> aropen_applyto is not null and (aropen_applyto = $1) ;
>
> IF (FOUND) THEN
> RETURN _paidamt ;
> END IF;
>
> RETURN 0.00 ;

> But all I get is either a blank or the amount paid. What am I doing wrong???
> Johnf

how many rows does the query return when no rows match the where?
It returns 1 that looks like ( NULL ).
it return 1 row, which is more than zero thus FOUND is TRUE.

you can fix your function by changing the IF to

IF _paidamt IS NOT NULL

but if you change the sum to

coalesce(sum(aropen_paid),0.00)

you can do the task more simply like this:

create or replace function danmeans_getpayments(text)
returns numeric as
$BODY$
select coalesce(sum(aropen_paid),0.00) FROM public.aropen where
aropen_applyto is not null and (aropen_applyto = $1) ;
$BODY$
LANGUAGE 'sql' ;

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