The Holdouts
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
- L5
Interview Prompt
Our basic-tier winback list keeps including people we already messaged during 2025, and they are supposed to sit this campaign out. In `push_notifs` the tier a message targeted is stored in `platform`; find the users who were sent a `basic`-tier notification but got nothing from us in 2025.
Summary
Subscribed. But never upgraded.
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