The support of generalization makes possible the creation of superclasses in the database schema for already existing classes. This paper gives an overview of an object oriented database model [6], called GENERAL, where coexist specialization and generalization. We will define specialization, ...
CHAPTER 3: THE ENHANCED E-R MODEL supertype/subtype relationships symbol : or specialization and generalization techniques Note: multivalued
chapter 6: generalization and specialization 1. when two classes have the same relation ship to another class, consider superclass and subclass them. 2. multisubclass two subclass can be achieved by superclass composite an interface and have two subclass to implement the interface. 3. using inher...
Generalization/Specialization User Generalization / Specialization Your application should support at least two types of users, e.g., end user, admin, sales, human resources, etc. Domain Model Generalization / Specialization Your domain model should also contain various specializations, e.g., several ...
Domain Model Generalization / Specialization Your domain model should also contain various specializations, e.g., several types of vehicles, several types of buildings, several types of jobs, etc. Object Relational Mapping and Data Access Layer ...
Domain Model Generalization / Specialization Your domain model should also contain various specializations, e.g., several types of vehicles, several types of buildings, several types of jobs, etc. Object Relational Mapping and Data Access Layer ...
特殊化/概化(Specialization/generalization) 聚合(aggregation) 组合(composition) Lu Wei 24 / Specialization/generalization was introduced for two additional reasons: To help in identifying the attributes and relationships specific to some entities, thereby enhancing the understanding of the ...
b) partial specialization. c) generalization. d) disjoint constraint. ___ solves the problem of presenting huge information system data models to users and developers. a) An E-R data model b) Entity clustering c) An EER data model d) A hierarchical arrangement A(n) ___ is an attribute...
We can look to generalization and specialization concepts to guide our design. Specifically, the common attributes can be place in a generalized entity, which in our case, is a person. The specialized attributes, are then placed in their own entities: customer, employee, and referrer. ...
■Chapter 2: Guided Tour of the Development Process ■Chapter 3: Initial Requirements and Use Cases ■Chapter 4: Learning from the Data Model ■Chapter 5: Developing a Data Model ■Chapter 6: Generalization and Specialization ··· (更多)...