Symmetric Reply Network
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
- L3
Interview Prompt
Our team chat logs every message in `chat_msgs`, where a reply records who it answered by storing that person's user ID in `reply_to` and an original post leaves it empty. Map the reply network: whenever one person replied to another, list that pair of user IDs in both directions.
Summary
Every reply is an edge. Draw it both ways.
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