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User Campaign Overlap Percentage

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
L5

Interview Prompt

For every pair of users, calculate the overlap ratio of shared ad campaigns relative to the smaller user's campaign set. Include only pairs that share at least one campaign. Show the two user IDs, the shared campaign count, and the overlap ratio.

Summary

How much ad overlap between users?

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

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