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Oct 31, 2023 · A subclass is a class derived from the superclass. It inherits the properties of the superclass and also contains attributes of its own. An example is: Car, Truck and Motorcycle are all subclasses of the superclass Vehicle.
Mar 18, 2024 · Superclass: The class or table whose methods and attributes are inherited is called the superclass or base class. Another name for it is the parent class. Subclass/Derived Class: In an inheritance structure, a subclass is a class or table that receives some methods and attributes from another class. Another name for it is the child class.
Oct 3, 2024 · Subclasses and Superclasses: EER model allows for the creation of a hierarchical structure of entities where a superclass can have one or more subclasses. Each subclass inherits attributes and relationships from its superclass, and it can also have its unique attributes and relationships.
The SubClass and SuperClass, Specialization and Generalization, Union or Category, Aggregation, etc., are displayed using this diagrammatic style. Generalization and Specialization. These are two normal kinds of relationships that were added to the normal ER model for enhancement.
We call the relationship between a superclass and any one of its subclasses a superclass/subclass or supertype/subtype or simply class/subclass relationship. In our previous example, EMPLOYEE / SECRETARY and EMPLOYEE / TECHNICIAN are two class/subclass relationships.
Normally, the superclass is defined first, the subclass and its related attributes are defined next, and relationship set are then added. For example: In an Employee management system, EMPLOYEE entity can be specialized as TESTER or DEVELOPER based on what role they play in the company.
Enhanced Entity Relationship Model - Tutorial to learn EER Model in simple, easy and step by step way with examples and notes. Covers topics like Features of EER Model, Sub Class, Super Class, Specialization, Generalization, etc.
Subclass: An entity type that represents a specific concept at lower levels. A subclass is said to inherit from a superclass. A subclass can inherit from many superclasses in the hierarchy. When a subclass inherits from one or more superclasses, it inherits all their attributes.
Sep 13, 2023 · Subclasses and Super class. Super class is an entity that can be divided into further subtype. For example − consider Shape super class. Super class shape has sub groups: Triangle, Square and Circle. Sub classes are the group of entities with some unique attributes. Sub class inherits the properties and attributes from super class.
In OO terminology, Manager is referred to as the subclass while Employee is referred to as the superclass. In general, a subclass specializes the superclass. The terminology makes sense set-theoretically: every Manager is also an Employee so the set of Managers is a subset of the set of Employees.
