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Campaign Conversion Window

A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
hard
Seniority
senior, staff

Interview Prompt

Our ad platform logs impressions, clicks, and purchases. For each campaign, compute the click-through rate and the conversion rate as percentages rounded to 2 decimal places. A conversion means a user who clicked an ad and then made a purchase within 7 days. Only include campaigns with at least 3 impressions.

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