The Regulars

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

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

Our engagement team is separating one-time visitors from users who form a real habit. From the session log, find the users who were active in at least three separate calendar months.

Summary

Some users drift off after one visit. Find the ones who kept coming back.

Practice This Problem

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