Campaign Cost Effectiveness
A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
An analyst closing the books on 2024 and 2025 wants to see which campaigns in `ad_impressions` gained ground across those two full years. For each campaign, report its total revenue over the two years and the share of its impressions served in 2025.
Summary
Money in, conversions out. What is the ratio?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision