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2FA Confirmation Rate

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

Interview Prompt

The security team is measuring how reliably users complete two-factor authentication across different client platforms. Only notifications with a delivered status count as valid 2FA pushes; everything else is noise. A push is considered confirmed when the user opened it. For each platform, compute the confirmation rate as a ratio of confirmed pushes to total delivered pushes.

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