The Widest Net
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
Find each campaign's true reach from `ad_impressions`: how many different registered users clicked at least one of its ads. The analyst building the campaign scorecard reads it 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 and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision