Create invoices-per-country.sql

Author: adminazhar

invoices-per-country.sql

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+SELECT co.country_name, count(*), AVG(i.total_price)
+FROM country co, city ci, customer cu, invoice i
+WHERE co.id = ci.country_id AND ci.id = cu.city_id AND cu.id = i.customer_id
+GROUP BY co.country name
+HAVING AVG(i.total_price) > (SELECT AVG(total price))