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The Day-7 Retention Cohort

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
mid, senior, staff

Interview Prompt

Given a users table (with signup dates) and a page_views table, write a query to compute day-7 retention by weekly signup cohort. For each cohort, return the cohort week, total signups, users who were active on day 7 or later, and the retention rate.

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