Subject sum and time fields
Author Redlet
Hi all,

I don't know if this is the right place to ask the following question.
Sorry if it's not.

I'd like to add time fields, something like :

select phone_number, sum(duration)
from phone_calls
group by phone_number
where ...

Of course, Firebird doesn't like this. How is it possible to do ?

Many thanks in advance.