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
The `chat_msgs` table logs team chat activity, where a reply stores the user ID of the person being replied to in `reply_to` while an original post leaves it empty. Map the symmetric 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