Customers With Returned Orders

Return the names of customers who returned at least one order, ordered by name.

Table schema

Customers(id INT PRIMARY KEY, name VARCHAR(10))
Orders(id INT PRIMARY KEY, customer_id INT, amount INT)
Returns(order_id INT, refund INT)

Sample data

Customers
id | name
1 | Ann
2 | Bob
3 | Cy

Orders
id | customer_id | amount
1 | 1 | 100
2 | 1 | 200
3 | 2 | 50
4 | 3 | 70

Returns
order_id | refund
2 | 200
4 | 30