Multi-Month Active Users

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

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

Identify users who logged sessions in at least 3 separate calendar months, based on session_start dates from user_sessions. Return the user ID.

Summary

Active this month and last month. Who stuck around?

Practice This Problem

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