ABSTRACT
There are many variations (models) of ER diagrams. One such model was introduced by Richard Barker (1990). The Barker model was adopted and modified slightly by the Oracle Corporation. In this chapter we introduce the conventions used in the Barker/Oracle-like model as it applies to our ER design methodology. We are going to depict major concepts of both Barker and Oracle’s ER diagrams. Our combined Barker/Oracle-like model is not meant as a primer on either party’s “pure model,” but the transition to Barker or Oracle’s ER diagrams will be minor.
