Mutual Channel Connections
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
- L4
Interview Prompt
Our chat platform stores one row per message, tagged with its sender and the channel it was posted to. Find the senders who have posted in both the '#engineering' and '#data-team' channels.
Summary
Two users. What channels do they share?
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