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A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain
SQL
Difficulty
medium
Seniority
L5

Problem

Pull basic-plan subscribers who never upgraded to premium from the subscriptions data. The retention team wants to run a winback campaign targeting this group.

Summary

Subscribed. But never upgraded.

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.

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