Why not?

   Select Table1.Loanumber,Sum(Isnull(Amount,0)) As Cuota From Table1
   Where Isnull(Amount,0)>0  --- Not really necessary

Enmanuel

>Hi friends. I have the following group of command in SQL:
>
>SELECT table1.loanumber, 'CUOTA' =
> CASE
> WHEN sum(table1.amount) is null then 0
> ELSE table1.amount
> END
>FROM table1
>where table1.amount > 0
>having CUOTA >0
>GO
>
>
>But, it send an error message : Invalid colun name 'CUOTA'
>Really I have more command lines in this group but this is the central idea.
>What can I do?...
>Thanks in advance.
>
>Carlos Burgos