5.12. What is the degree of relationship? Give an example of a relationship of d
ID: 3621102 • Letter: 5
Question
5.12. What is the degree of relationship? Give an example of a relationship of degree three(other than one presented in this chapter).
5.13 What is a binary relationship?
5.15 What does cardinality mean?
5.16 Define the terms maximum cardinalityandminimum cardinality.
5.26 What is an identifying relationship? How is it used?
5.28 What is a weak entity? How do weak entities relate to ID-dependent entities?
5.30 Define subtypeandsupertype. Give an example of a subtype–supertype relationship
(other than one presented in this chapter).
5.31 Explain the difference between exclusive subtypes and inclusive subtypes. Give an
example of each.
5.32 What is a discriminator?
5.33 Explain the difference between IS-Aand HAS-Arelationships.
5.39 Describe two tests for determining if an entity is a strong entity.
5.42 How can you assess minimum cardinality for the entities in the form in Figure 5-17?
5.44 Name three patterns that use ID-dependent relationships.
5.45 Explain how the association pattern differs from the N:M strong entity pattern. What
characteristic of the report in Figure 5-21indicates that an association pattern is needed?
5.53 What entity type should come to mind when you see the words “For use by” in a form?
Explanation / Answer
Dear user, 5.12 The degree of a relationship is the number of entities associated with the relationship. A relationship of degree three is called as ternary relationship. It involves three entities. 5.13 A relationship in which two entities are associated is the binary relationship. 5.15 Cardinality means the number of relationship instances that an entity can participate in. 5.16 Minimum cardinality is the minimum number of relationship entities that each entity can participate in. Maximum cardinality is the maximum number of relationship entities that each entity can participate in. 5.26 The relationship that relates a weak entity type to its owner is the identifying relationship.
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