Losing Altitude
A hard 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
- hard
- Seniority
- L5
Interview Prompt
A stakeholder flagged that some ad campaigns lost momentum between June and October of 2026. Within each of those two months, place the campaigns by how many of their impressions were clicked, most first, and surface the campaigns that sat lower in October than they did in June.
Summary
Two months apart, the same campaigns. Find the ones that slipped.
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