Activity Histogram
A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
Retention modeling suspects the platform has a bimodal usage pattern: a cluster of one-and-done visitors and a cluster of heavy regulars with little in between. Build a histogram of session counts so the team can see how many users fall at each level of activity, from lowest to highest.
Summary
How many users did X things? Build the distribution.
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