Chapter 4, Problem 4.27RQ

Explanation of Solution

Data model:

Data model is the representation of object by different graphic symbol and illustrates the relationship between the object.

• It converts the complex system design into the understood representation of data flows and processes.
• Entity, attribute, and relationship are the three basic elements of data model.
• The data model can be divided into three types:
  • Object based data model.
  • Physical data model.
  • Record based data model.

Purpose of data model:

The purpose of data model to define the relationship between data and describes how the data stored in computer memory...