The Conversion Story
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
- L5
Interview Prompt
We're measuring how each referral source turns signups into paid purchases, using the event_data log. Classify every event by its tags as organic, referral, campaign_a, campaign_b, or other, and for each source report its conversion rate: users who purchased over users who signed up.
Summary
Signups are one thing. Paid purchases are another. Find the gap by source.
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