Group orders into size buckets: 'small' (total under 75), 'medium' (75 up to but not including 200) and 'large' (200 or more). Return bucket, orders (the count) and revenue (the sum of totals) for each bucket that has orders, in the order small, medium, large (not alphabetical).
Schema
customers(id, name, country, signup_date)
orders(id, customer_id, order_date, total)