I would imagine it is up to interpretation. It would probably be a good thing to ask the interviewer about to show that you are thinking about edge cases.
If it were me, I'd prefer to see those that made no sales based on the question. I guess if I didn't want to see them, I would ask for "where sales are greater than $0.00".
If it were me, I'd prefer to see those that made no sales based on the question. I guess if I didn't want to see them, I would ask for "where sales are greater than $0.00".