420. Top Customer per Product Category

Medium Marketing Customer Segmentation

Query Rules

The query columns and order must match the expected result schema.
NULL values should be handled appropriately where applicable.
The grader compares output values and sorting order to evaluate.

Schema Browser

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locations

3 cols

departments

3 cols

employees

6 cols

orders

6 cols

Reference Solution

Expected SQL

SELECT product_category, customer_name, total_spent FROM (SELECT product_category, customer_name, SUM(amount) AS total_spent, ROW_NUMBER() OVER (PARTITION BY product_category ORDER BY SUM(amount) DESC) AS rn FROM orders GROUP BY product_category, customer_name) sub WHERE rn = 1 ORDER BY product_category;

SQL Editor

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Console Output

Console Terminal

Write your query and click "Run Query" (Ctrl + Enter) to see results and testcase validation.