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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
senior

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.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision