Loyalty's Double Tap
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
- L3
Interview Prompt
Growth wants to know whether push notifications and display ads reinforce each other. Count the clicked ad impressions belonging to users who were also part of a loyalty push-notification campaign (any campaign whose name contains 'loyalty', case-insensitive). Join ad_impressions to push_notifs on user_id, keep only clicked impressions, and return the total count as impression_count.
Summary
When a nudge and a banner team up.
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