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Servers Returning to Origin

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
L4

Interview Prompt

How many servers ended up back in their original region? 'Original' means the region of their first recorded migration, and 'ended up' means the region of their last. Return a single count.

Summary

Servers that migrated back home.

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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