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First Interaction Credit

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

Interview Prompt

Given a ad_impressions table (user_id, ad_campaign, timestamp) and a transactions table, write a query to assign first-touch attribution. For each converted user, return their user_id and the ad_campaign from their earliest interaction.

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