Chapter 4. Building More-Complex Applications with Relationships and Details Screens

Companies are quite complex. They produce a number of products that are placed in stock and given an identifier and a unit price. They have customers that buy their products, so they need to keep track of customer information, such as physical address, email address, phone number, and so on. Customers buy products via orders. Each order has a date, a required date, and a shipment date; also, each order contains the list of products that customers want to buy. When the order shipment is finalized, the company creates an invoice and sends it to the customer.