Your question is Using SQL to Solve Data Problems. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you used SQL heavily to solve an important data problem. Walk me through the business context, the specific queries or techniques you used, how you validated the output, and what impact your work had.