Rep (RepNum, LastName, FirstName, Street, City, State, Zip, Commission, Rate)
Customer (CustomerNum, CustomerName, Street, City, State, Zip, Balance, CreditLimit, RepNum)
Orders ( OrderNum, OrderDate, CustomerNum)
OrderLine (OrderNum, PartNum, NumOrdered, QuotedPrice)
Part (PartNum, Description, OnHand, Class, Warehouse, Price)
On the basis of code above, list the number and name of all the customers.