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Cross-Variant User Pairs
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid, senior
Problem
The experimentation team is looking for cross-variant contamination. Pair users who participated in the same experiment under different variants but on the same platform. Show both user IDs for each qualifying pair.
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.