Re: something simple but I can't

On 2011-01-29, John Fabiani <johnf@jfcomputer.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)
FROMpublic.aropen where  aropen_applyto is not null and (aropen_applyto = $1) ;$BODY$  LANGUAGE 'sql' ;
 

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