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Most Efficient High-Volume Campaign

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
mid, senior

Interview Prompt

We want the campaign with the lowest peak monthly spend that still delivers at least 1 click every month it runs. Monthly clicks are the sum of clicked impressions, and monthly spend is the sum of revenue. Return just the campaign name.

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