Welcome to your interview.
The question is on your right: SQL for Business Rule Validation. 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.
Describe your experience working with relational databases. How do you use basic SQL queries or data structures to validate business rules?