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Cheapest CDN Route

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

Domain
SQL
Difficulty
hard
Seniority
senior, staff

Interview Prompt

The cdn_logs table records hops between edge locations with an associated byte cost. Find the cheapest route from 'us-east' to 'eu-west', considering direct connections and paths with up to two intermediate stops. Normalize location names to lowercase. Return the cheapest total cost.

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