4.1.2 Stages in Conceptual Modeling
4.1.3 Components of a Conceptual Data Model
4.1.4 ER Modeling Basic Concepts
4.1.5 Enhanced ER Modeling
4.1.6 Guidelines for ER Modeling
No attribute is specified.
No primary key is specified.
Main stages in conceptual modeling are as follows:
-- Designing of solutions
-- Evaluation of solutions
4.1.4 ER Modeling Basic Concepts
Describes data as entities, relationships and attributes
No standard notation for displaying ER diagrams
(We will choose one among several alternatives for this presentation)
An entity may be an object with a physical existence
For example, person, car, house
An entity may be an object with a conceptual existence
For example, company, job, university-course
Enhanced ER Model, Includes all the modeling concepts of the ER model
In addition, it includes the following concepts:
- Subclass & super-class
- Specialization & generalization
- Category
- Attribute & relationship inheritance
Subclass & Super-class
- In many cases an entity type has numerous sub-groupings of its entities that are meaningful and need to be represented explicitly because of their significance to the database application. Each of these sub-groupings are called subclass.
- The entity type on which these subclasses are formed is called super-class
- The relationship between a super-class and any one of its subclasses is called a super-class/subclass, a class/subclass or an IS-A (or IS-AN) relationship, e.g., a SECRETARY IS-AN EMPLOYEE
- A member entity of a subclass represents the same real-world entity as some member of the super-class, but in a distinct specific role
Specialization (Top to Bottom Approach)
Specialization is the process of defining a set of subclasses of an entity type
In addition, it allows us to do the following:
- Establish additional specific attributes with each subclasses
- Establish additional specific relationship types between each subclass and other entity types or other subclasses
Generalization (Bottom to Top Approach)
Generalization refers to the process of defining a generalized entity type from the given entity types
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