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Questions and Answers
What type of relationship is defined between a class and a set of member classes?
What type of relationship is defined between a class and a set of member classes?
- Composition Relationship
- Identifying Relationship (correct)
- Aggregation Relationship
- Generalization Relationship
What type of entity is a subclass that depends on the existence of a superclass?
What type of entity is a subclass that depends on the existence of a superclass?
- Weak Entity (correct)
- Associative Entity
- Entity Type
- Strong Entity
What is the term for the primary key of a weak entity that is partially dependent on the primary key of the strong entity?
What is the term for the primary key of a weak entity that is partially dependent on the primary key of the strong entity?
- Secondary Key
- Partial Key (correct)
- Primary Key
- Foreign Key
What is the process of creating a new entity type from an existing entity type?
What is the process of creating a new entity type from an existing entity type?
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What type of entity is used to represent a many-to-many relationship between two entities?
What type of entity is used to represent a many-to-many relationship between two entities?
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Study Notes
Types of Entities
- Student grades depend on the student and the course
Generalization
- Inheritance that encapsulates common characteristics of many subordinate entities
- Example: a car entity consists of engine, chassis, gear box, etc. as its subordinate entities
Specialization and Generalization Abstractions
- ERD in its original form did not support these abstractions
- Specialization defines a set-superset relationship between a class and a set of member classes
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