405. Pareto Principle (80/20 Rule)

Hard Consulting Advanced Analytics

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

Click a table's header to toggle expand/collapse.

locations

3 cols

departments

3 cols

employees

6 cols

orders

6 cols

Reference Solution

Expected SQL

WITH cat_sales AS (SELECT product_category, SUM(amount) AS revenue FROM orders GROUP BY product_category), total_sales AS (SELECT SUM(revenue) as global_total FROM cat_sales) SELECT product_category, revenue, SUM(revenue) OVER (ORDER BY revenue DESC) * 100.0 / (SELECT global_total FROM total_sales) AS cumulative_pct FROM cat_sales;

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.