The Loudest Rooms
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
- L4
Interview Prompt
We run a community app where the people who post in chat channels are the same people we serve ads to. For each channel, find how many ad impressions reached the people who post in it, busiest first.
Summary
Every channel has an audience. Find where it is biggest.
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