I went to a job interview recently where the interviewer was trying to phrase the question properly: "I'm trying to figure out how to ask this next one, so if you have a lot of Customers, and... umm..."

And I interjected during a long pause and said "It sounds like you're trying to ask a question which could be answered by using a HAVING clause. So something like, only those Customers who have two or more orders, which would be 'GROUP BY Customers HAVING count(Orders) > 2'."

I was right, he was looking for that. Still didn't get the job.