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Find usernames that have NO transactions

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

Domain
SQL
Difficulty
medium

Problem

Find usernames that have NO transactions. Use LEFT JOIN and WHERE t.transaction_id IS NULL. Return just the username ordered ascending.

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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