The Tag Order

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

Domain

SQL

Difficulty

hard

Seniority

L3

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.

Summary

Tags arrived in chaos. The system needs them in line.

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