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A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- junior
Problem
The data quality team is standardizing event metadata. For all signup events, normalize the tags column to lowercase. Return the event ID and the normalized tags, ordered by event ID.
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.