Symmetric Reply Network
A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- 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 and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision