Barbury Company sells machine parts to manufacturing companies. Parts usually are purchased to replace worn or broken parts. Most of Barbury’s customers order goods by phone or through Internet connections from regional sales offices throughout North America. Sales are made on credit and are shipped immediately to avoid manufacturing delays at customer plants. Barbury uses a relational database for its accounting system.

Required
Explain the purpose of a relational database and why it is useful to a company. Describe the parts of a relational database and identify specific examples of how these parts would be used by Barbury to obtain and fill customer orders.