Welcome to your interview.
The question is on your right: Structure Retention Cohort Analysis. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Cohort retention is a common product analytics pattern used to measure how well users return after signup or first activity. Interviewers ask this to evaluate whether you can translate a business metric into a clean SQL workflow.
Explain how you would structure a SQL analysis to measure retention by cohort. Your answer should cover:
Focus on the SQL design and reasoning rather than a single exact query. The interviewer expects a practical explanation of the steps, common table structure, and the main pitfalls that affect correctness.