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15. Exercise 1


For this quiz, we’ll be using a small table named customer_order. The following columns are available: id, country, customer, customization, and total_price. You can use the button on the right side to analyze this table’s contents before we start.


Find the average total price in all grouping combinations made from the following columns: country, customer, and customization.

Show the following columns in the query result: country, customer, customization, and avg_price.