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Verify Commit ID Uniqueness

A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
easy
Seniority
L3

Interview Prompt

You suspect duplicate commit IDs crept into the repo metadata table. Show the total count of commit IDs next to the count of unique commit IDs so you can verify at a glance.

Summary

Duplicate commit IDs. Are there any?

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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