Quarterly Revenue by Category
Problem
**[Widely asked at Amazon and retail companies]**
Group sales into calendar quarters (Q1 = Jan–Mar, Q2 = Apr–Jun, Q3 = Jul–Sep,
Q4 = Oct–Dec) and calculate total revenue per category per quarter.
Return `quarter` ('Q1'…'Q4'), `category`, and `total_revenue`,
ordered by quarter then category.
Tables
Example rows — the live problem includes the full dataset.
category_sales
| sale_id | category | amount | sale_date |
|---|
Expected output
Your answer should return 6 rows with the columns quarter, category, total_revenue.
Starter code (SQL)
SELECT *
FROM category_sales;Solve this SQL question free
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Solution & explanation
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