Welcome to your interview.
The question is on your right: SQL for Usage vs Billed Mismatch. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Write a SQL query to identify all customer accounts where the billed amount in a given month does not match the recorded usage data in our product database at Harvey.