I have a data model which includes five inter-related tables - it's a common task of connecting customers, orders, items, order details and employees.

When I need to enter a new order I have to enter different ID's into different tables i.e: into table Orders I have to enter ID_Order,ID_Cos tumer and ID_Employee, into table OrderDetails I have to enter for each item ID_Order and ID_Item...

And also, when I enter those...