The Widest Net
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
The ad analytics team wants each campaign's true reach: how many different registered users clicked at least one of its ads, counting a person once however many times they clicked. Keep campaigns that drew no clicks at all, and list the widest-reaching first.
Summary
Not the clicks. The crowd: how many people each campaign actually pulled in.
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