Best Day for Ad Revenue
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
The ad team wants to identify which day of the month shows the strongest click premium: the biggest gap between average revenue on clicked impressions versus non-clicked ones. For each calendar day (1 through 31), compute the overall average revenue and the peak single-impression revenue. Return only the one day where the click premium is widest.
Summary
One day of the month outperforms the rest.
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