Engagement Gap
A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
The product analytics team wants purchasing activity across the entire user base, including the people who have never bought anything. Show each user's username next to how many purchases they have made.
Summary
Zero transactions is still a data point. Count everyone.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision