Who Stayed

A hard SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.

Domain
SQL
Difficulty
hard
Seniority
L5

Interview Prompt

A month with no session breaks a streak, and only January through June of 2026 counts. From `user_sessions`, give every user active in that window their longest run of back-to-back months with at least one session, plus a standing based on that streak length.

Summary

Day after day after day. Who kept coming back?

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write and run your SQL against a real database
  4. Answer the interviewer's follow-up questions, then get a hire or no-hire decision