Customer
  CustomerID	System.String
  Customer_Id	System.Int32

Order
  OrderID		System.Int64
  Order_Id		System.Int32
  Customer_Id	System.Int32

LineItem
  ProductID		System.Int32
  Quantity		System.Int32
  UnitPrice		System.Decimal
  Order_Id		System.Int32
  
Customer:
CustomerID		Customer_Id
ALFKI			0

Order:
OrderID			Order_Id		Customer_Id
10966			0			0

LineItem:
ProductID		Quantity	UnitPrice	Order_Id
37				8			26.5		0
56				12			38			0