Ghosts in the Campaign
A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
We run ad campaigns and log every impression, and we're reviewing the holiday campaign. For each of its impressions return the impression together with the matching user's details, keeping every impression even when no user record matches. Include all fields from both tables.
Summary
The holiday sale campaign. How did it do?
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