423. New vs Returning Customer Revenue Split

Hard Growth Business Intelligence

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

WITH first_order AS (SELECT customer_name, MIN(strftime('%Y-%m', order_date)) AS first_month FROM orders GROUP BY customer_name) SELECT strftime('%Y-%m', o.order_date) AS month, SUM(CASE WHEN strftime('%Y-%m', o.order_date) = f.first_month THEN o.amount ELSE 0 END) AS new_customer_revenue, SUM(CASE WHEN strftime('%Y-%m', o.order_date) != f.first_month THEN o.amount ELSE 0 END) AS returning_customer_revenue FROM orders o JOIN first_order f ON o.customer_name = f.customer_name GROUP BY month ORDER BY month;

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Console Output

Console Terminal

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