-- Oefening 1

SELECT cust_name, cust_contact
FROM Customers, Orders, OrderItems
WHERE Customers.cust_id = Orders.cust_id AND OrderItems.order_num = Orders.order_num AND prod_id = 'RGAN01';

-- Oefening 2

CREATE VIEW ProductCustomers AS
SELECT cust_name, cust_contact, prod_id
FROM Customers, Orders, OrderItems
WHERE Customers.cust_id = Orders.cust_id AND OrderItems.order_num = Orders.order_num;

-- Oefening 3

SELECT cust_name, cust_contact
FROM ProductCustomers
WHERE prod_id = 'RGAN01';