Honeymoon Phase

A medium 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
medium
Seniority
L5

Interview Prompt

We track customers as signup cohorts, one per registration year, to gauge how sticky each class was right after joining. For every signup year, take the transactions made by that year's cohort and report the share that landed in the same calendar year the customer registered.

Summary

Every signup class starts hot. Which ones spend the year they arrive?

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