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To identify entities and their relationships. To describe entities using attributes, multivalued attributes, derived attributes, and key attributes.

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Figure

Figure 3.3 shows an ER diagram for the Course entity class  and its attributes. An entity class is represented by a
Figure 3.8 shows an ER diagram that describes the  relationships among Student, Course and Subject
Figure 3.1 illustrated the redundancy problem in the
Figure 3.25 shows an instance of the relation.

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