attribute and relationship inheritance Example: EMPLOYEE may be further grouped into: Example: Another specialization of EMPLOYEE based on
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[PDF] Enhanced Entity-Relationship and Object Modeling Objectives
Example: EMPLOYEE entity refers to: The attributes and relationships of each We say that an entity that is a member of a subclass inherits all the attributes of
[PDF] Object-Oriented DBMS Concepts - NUS Computing
A class hierarchy provides an inheritance mechanism which allows a class to inherit properties (attributes and methods) from its superclasses In single inheritance systems, a class can have at most one direct superclass and therefore can only inherit from that superclass The class hierarchy forms a tree
Mapping Generalization and Object Sharing into Nested Relations
shorter times with the added facilities of an available relational DBMS (i e , transaction In the other case [B090], attribute inheritance was implemented on top
[PDF] Part 3 Enhanced ER Diagram
Subclasses, superclasses, and inheritance • Specialization inheritance • A subclass inherits all attributes of its superclass – Example: • Employee has a
[PDF] ch04-Enhanced Entity-Relationship (EER)
attribute and relationship inheritance Example: EMPLOYEE may be further grouped into: Example: Another specialization of EMPLOYEE based on
[PDF] The Enhanced Entity- Relationship (EER) Model
attribute and relationship inheritance • superclass / subclass relationship • example: SECRETARY, ENGINEER, MANAGER, -> a subset of the entities that
[PDF] Use of Inheritance Feature in Relational Database Development
object-relational database management system (ORDBMS) to overcome relational and have that type inherit existing attributes from employee_ty [11]
[PDF] Conceptual Modeling of Data
Partially automated techniques to map to logical (DBMS dependent) model Attribute Inheritance: subclasses inherit all the attributes of the superclass
[PDF] THE ENHANCED ER (EER) MODEL
Specific relationship types ▫ Subclass can be a subclass wrt more than one superclass ▫ Type inheritance • Subclass entity has all attributes and participates
[PDF] Specialization
Subclasses, Superclasses, and Inheritance • Specialization Example of Other Notation: Representing Subclass entity inherits all attributes and relationships
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