35+ additional features of the er model

ER-Diagram is a pictorial representation of data that describes how data is communicated and related to each other. Any object such as entities attributes of an entity sets of relationship.

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For instance a subset of.

. Features of EER Model. An ERD contains different symbols and. Extended E-R Features - Specialization.

The extended E-R features are specialization generalization higher- and lower-level entity sets attribute inheritance and aggregation. Key Attribute The attribute which uniquely identifies each entity in the entity set is called key attributeFor example. It provides a collection of basic concepts that can be easily implemented in a database.

It includes all modeling concepts of the ER. Consider an organization as an example-. Considering the above example Student is an entity Teacher is an entity similarly Class Subject etc are also entities.

Component of ER Diagram 1. It reflects the data properties and constraints more precisely. Specialization The process of designating to sub grouping within an entity set is called specialization.

Entity and Entity Set. Features of ER model It is widely used to develop the initial design of the database. Which are the extended feature of ER.

In above figure the person is distinguish. An E-R model paths a way to represent these different entity groupings. It works around real-world entities and the associations among them.

In the ER diagram an entity can be represented as rectangles. At view level the ER model is considered a good option for. Join our biggest Student Community to learn new skills and grow in your career httpsdiscordgg2kA86Q8CnUEduMoon Tutorials on Data Base Management System.

For example a subset of entities in an entity set may have attributes that are not common among all the other entities in. An entity set may include sub-groupings of entities that are distinct in some way from other entities in the set. Entity Relationship Diagram also known as ERD ER Diagram or ER model is a type of structural diagram for use in database design.

An entity may be any object class person or place. EER creates a design more accurate to database schemas. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators.

The ER model defines the conceptual view of a database. An Entity is generally a real-world object. ER Model Gives us a language to specify what information the database must hold what are the relationships among components of that information Proposed by Peter Chen in 1976.

In ER diagram attribute is represented by an oval.

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