Building and Organizing Complex Queries - More concise answer

I’ve written this query, which is more concise than the provided answer (it can surely be improved though)

WITH total_customer_country AS
SELECT c.customer_id customer_id, country,
(c.first_name || ’ ’ || c.last_name) customer_name,
SUM(total) total_purchased
FROM customer c
LEFT JOIN invoice i ON i.customer_id = c.customer_id
GROUP BY country, customer_name

SELECT country, customer_name, MAX(total_purchased) total_purchased
FROM total_customer_country
GROUP BY country
ORDER BY country

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Hi @burnier: I have changed your article to the right category.

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