Welcome to your interview.
The question is on your right: Data and SQL Query Concepts. 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.
Explain the difference between UNION and UNION ALL, DELETE and TRUNCATE, and EXISTS and IN. Also, name types of joins and an ETL tool.