# Return user_id and username from users where user_id is in the set of user_ids that appear in transa

Canonical URL: <https://datadriven.io/problems/return-userid-and-username-from-users-where-userid-is-in-t-c04eb961>

Domain: SQL · Difficulty: medium

## Problem

Return user_id and username from users where user_id is in the set of user_ids that appear in transactions. Use a subquery with IN. Order by user_id ascending.

## Related

- [All practice problems](https://datadriven.io/problems)
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