Six Degrees
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
- L5
Interview Prompt
Across the company chat history, every reply connects two people, the sender and the person being replied to, and that connection runs both ways. For each person, count how many different people they are connected to, then express that as a percentage of everyone who has ever sent or received a message. Show the most connected people first.
Summary
Every reply ties two names together. Find whose web reaches the furthest.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision