7-Day Onboarding Conversion

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

What share of the `experiments` entries made since 2023 led to a meaningful session in `user_sessions` within 30 days of the entry date? The growth team reads it per variant, as total entries, converted entries and a conversion percentage.

Summary

Signed up Monday. Still here by Sunday?

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