Welcome to your interview.
The question is on your right: Reduce Subqueries and Joins. 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.
What strategies would you use to minimize subqueries and avoid unnecessary joins when working with multi-million row tables at Advance Auto Parts?