Object-Oriented DBMS Concepts
A class hierarchy provides an inheritance mechanism which allows a class to inherit properties (attributes and methods) from its superclasses. • In single
COSC 304 Introduction to Database Systems Enhanced Entity
?1) When using attribute inheritance can reduce the use of nulls in a single entity relation (that contains multiple subclasses).
Object-Oriented Database Systems
Problem of Multiple Inheritance. • Inherit Attributes methods from: • Both/ALL superclasses. • Only dominant superclass (all cases or only where conflict).
Enhanced Entity-Relationship (EER) Modeling
attribute and relationship inheritance Attribute Inheritance in Superclass /. Subclass Relationships. An entity that is member of a subclass inherits.
Chapter 4
Specialization/generalization. • Associated with special types of entities known as superclasses and subclasses and the process of attribute inheritance.
Chapter 2: Entity-Relationship Model E-R Diagrams
Generally most relationship sets in a database system are binary. Attribute inheritance – a lower-level entity set inherits all the.
Chapter (4) Enhanced Entity-Relationship and Object Modeling
is the union of objects of different entity types. • Concepts is the important mechanism of attribute and relationship inheritance. • Diagrammatic technique for
advanced database systems - course name
Multiple inheritance occurs when a certain subtype T is a subtype of two (or more) types and hence inherits the functions (attributes and methods) of both
Week 5 Lecture 2
INF3100/INF4100 – Database Systems OO concepts and OO-DBMS properties ... Sub-types INHERIT properties (attributes and operations) from super-types.
