Rooms in Common
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
We map user networks through our chat channels: two people count as connected once they've both posted in the same channel. For each sender, find how many other people they're connected to.
Summary
Two people, one channel, a connection you never counted.
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