Welcome to your interview.
The question is on your right: Identify Underperforming Products. 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.
Given a production details table and a sales details table, write a query using a Common Table Expression and an inner join to identify underperforming products.