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_messages table has sender and reply_to columns. Produce a symmetric view of the reply network: if user A replied to user B, the output should include both (A, B) and (B, A). Show each pair of user IDs.
Summary
Who replies to whom? Both directions.
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