Overview The ability of a database designer to understand and model the information that an organization
uses is a critical design skill. Data modelers use a variety of tools and techniques to understand
an organization’s data. In order to understand how to properly model data, you must become
.Familiar with a modeling approach known as entity relationship modeling,
(Entity-relationship (E-R)Entity-relationship (E-R) modeling is one approach to semantic modeling. When database
Designers attempt to understand and represent meaning, they are engaged in semantic modeling,
which can help in making database design more systematic (Date, 1990). Although a number of
approaches to semantic modeling exist, this chapter focuses on entity relationship modeling.
More specifically, we use E-R modeling to carry out conceptual data modeling ER modeling, introduced consists of a number of activities that help database designers understand the objects the organization wants to store information about, the important characteristics of these objects and the associations among various objects.
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