How do I practice SQL interview questions?

PracHub provides an interactive SQL console where you can write and test queries against real database schemas. Get instant feedback and compare your solution with the expected output.

What difficulty level is this coding question?

This is a medium difficulty Data Manipulation (SQL/Python) question, commonly asked during Technical Screen rounds at Amazon.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Amazon during technical interviews.

Monthly Cohort Retention | Amazon SQL Question

Quick Overview

This question evaluates practical SQL skills in user retention analysis, specifically the ability to build a monthly cohort retention table from raw activity logs. It tests date truncation, window-based grouping, and aggregation logic commonly required in data science and analytics roles. The question targets applied SQL proficiency and product analytics thinking under real-world schema constraints.

medium
Amazon
Data Manipulation (SQL/Python)
Data Scientist

Quick Overview

medium
Amazon
Data Manipulation (SQL/Python)
Data Scientist

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