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Negative Outcome Rate for New Users

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
senior

Interview Prompt

Given a users table with signup dates and an event_data table with event types and timestamps, write a query to calculate the negative outcome rate for new users. For users who signed up in each month, compute the fraction of their events (within 14 days of signup) that are of type error, timeout, or crash.

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