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
The growth team tracks how well each monthly signup cohort sticks around after joining. For every cohort, report the cohort month, how many users signed up, how many of them came back to do something a week or more after signing up, and the share that represents.
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