IT

/ Relational database practices.

Exercise 1: Analyze the features of a relational database .

ABC Ltd plans to computerize its sales ordering and stock control system. A feasibility study has strongly suggested that a

relational database system be installed. The details of ABC's sales and stock control are as follows:

a. Customers send in orders for goods. Each order may contain requests for variable quantities of one or more products from

ABC's range. ABC keeps a stock file showing for each product the product details and the preferred supplier, the quantity in

stock, the reorder level and other details.

b. ABC delivers those products that it has in stock in response to the customer order and an invoice is produced for the

dispatched items. Any items that were not in stock are placed on a back order list and these items are usually re-ordered from

the preferred supplier. Occasionally items are ordered from alternative sources.

c. In response to the invoices that are sent out to ABC's customers, the customers send in payments. Sometimes a payment will

be for one invoice, sometimes for part of an invoice and sometimes for several invoices and part-invoices.

d. Identify the tables and associated fields from the above scenario.