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Transaction-Only Features
A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- senior
Problem
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.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.