What are extra features of extended ER diagram?

The extended E-R features are specialization, generalization, higher- and lower-level entity sets, attribute inheritance, and aggregation. An entity set may include subgroupings of entities that are distinct in some way from other entities in the set.

What are additional features of ER model?

Generalization, Specialization and Aggregation in ER model are used for data abstraction in which abstraction mechanism is used to hide details of a set of objects. Generalization is the process of extracting common properties from a set of entities and create a generalized entity from it.

What are the features of ER diagram?

Also known as ERDs or ER Models, they use a defined set of symbols such as rectangles, diamonds, ovals and connecting lines to depict the interconnectedness of entities, relationships and their attributes. They mirror grammatical structure, with entities as nouns and relationships as verbs.

What is an ER diagram and what does it represent?

ER diagrams are a visual tool which is helpful to represent the ER model. Entity relationship diagram displays the relationships of entity set stored in a database. ER diagrams help you to define terms related to entity relationship modeling. ER model is based on three basic concepts: Entities, Attributes & Relationships.

Which is an example of an extended E-R feature?

Although the basic E-R concepts can model most database features, some aspects of a database may be more aptly expressed by certain extensions to the basic E-R model. In this section, we discuss the extended E-R features of specialization, generalization, higher- and lower-level entity sets, attribute inheritance, and aggregation.

How does an Entity Relationship Diagram ( ERD ) work?

ENTITY-RELATIONSHIP DIAGRAM (ERD) displays the relationships of entity set stored in a database. In other words, we can say that ER diagrams help you to explain the logical structure of databases. At first look, an ER diagram looks very similar to the flowchart.

What is an extended entity relationship ( EER ) model?

Extended Entity-Relationship (EE-R) Model. EER is a high-level data model that incorporates the extensions to the original ER model. Enhanced ERD are high level models that represent the requirements and complexities of complex database. Subclasses and Super classes.