Any advice on count when sum 0

Question

Hi there
We would like to have 1 sql such that
count when sum of value in column > 0 . Problem is sum an aggregate function and also count.
As example imagine 2 customer records, one has a -ve value e.g -4 and 1 a positive value of +5 so sum of these values = +1. Such a customer we would like to include in the count and can't simply use having clause as we wish to include in report all sales reagrdless of whether > 0 but a separate count field to highlight the ones which are greater than 0
Current sql
select sum(value), cola..
from table
group by col1..
can't say
select count(case when sum(value) > 0 then distinct cust_id end)
as get ora-message about nested group by functions..
Anybody done such a thing before - would analytical functions work in this situation.
Many Thanks

Answer 1

Hi there,
Thanks very much for the replies.
One problem though, unfortunately the reporting tool we use is quite constrained and we can't implement the solutions proposed in it - they would have been preferable.
Example of data
table called transaction with all different types of transactions
Main fields, trans-code, cust_id, product_id, trans_qty, trans_date
Each row has a different trans code, e.g supply code, return code.
We wish to identify no of custs sold out. A customer could have several supply transaction records for the same product and potentially several different return transactions.
If the sum of all the supply transactions for a customer/product > 0 and the sum of all the credit transactions for a customer/product = 0 then we count this as a sell-out.
Is it possible to code this as an analytical function - if so how?
Many Thanks