Experiment Impact
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
The data science team is auditing how each experiment performed inside the variant buckets it ran in. For every experiment and variant pairing, compute the average outcome and the participant count, then within each variant order the experiments from the highest average down and give each two standings: one that leaves a gap after tied experiments, and one that stays consecutive so the next lower average is always the next number up. Return the exp_name, variant, average outcome, participant count, and both standings.
Summary
Which experiments moved the needle? Settle the standings inside every variant.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision