Transaction-Only Features
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
The ML team is isolating features exclusive to the 'transactions' source that do not appear in 'page_views' or 'ad_impressions'. Two features are considered equal if they share the same name and data type. Show the feature name, data type, average value, and null percentage, ordered by feature name.
Summary
Exclusive to one source. Missing from the other.
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