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.

Compute a Rolling Seven-Day Revenue Sum with Missing Dates

Quick Overview

Solve a PostgreSQL rolling-revenue problem that needs a complete daily series per seller, including no-order dates. It assesses UTC date handling, gap filling, status filters, window semantics, numeric precision, and partial seven-day histories.

Quick Overview

medium
Amazon
Data Manipulation (SQL/Python)
Data Scientist

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