The Seventh Day
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
A growth team measures how well each monthly signup cohort sticks around: the share of a month's new users who come back to do something a week or more after joining. Report each cohort month, its total signups, how many of those users came back that late, and that share as a percentage.
Summary
Day one was promising. Day seven tells the truth.
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