The Company You Keep

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

Count the Friday sessions in `user_sessions` per date for the users the experimentation team is tracking. Those are the users who share an experiment in `experiments` with at least one other user.

Summary

Only experiments with a crowd count. Find the Friday sessions they drove.

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