Entity Relationship Model 01: Entity

Опубликовано: 01 Октябрь 2024
на канале: Data Science Center

565

ER Model Introduced by Peter Chen in 1976
It is logical representation of the data for an organization
E-R Model is expressed in the term of entities, attributes and relationships.
Graphical representation of an entity relationship model is called Entity Relationship Diagram (ERD).
It is a semantic data model
A semantic data model, used for the graphical representation of the conceptual database design.
Entity

An entity is a person, place, object, event, or concept in the user environment about which organization wish to maintain the data.
Entity is used to three different meaning
Entity type
Entity Instance
Entity set