ER Diagram: Entity Relationship Diagram Model

ER Diagram stands for Entity Relationship Diagram, also known as ERD is a diagram that displays the relationship of entity sets stored in a database. In other words, ER diagrams help to explain the logical structure of databases. ER diagrams are created based on three basic concepts: entities, attributes and relationships.

ER Diagrams contain different symbols that use rectangles to represent entities, ovals to define attributes and diamond shapes to represent relationships.

At first look, an ER diagram looks very similar to the flowchart. However, ER Diagram includes many specialized symbols, and its meanings make this model unique. The purpose of ER Diagram is to represent the entity framework infrastructure.

Entity Relationship Diagram Example


What is ER Model?


ER Model stands for Entity Relationship Model is a high-level conceptual data model diagram. ER model helps to systematically analyze data requirements to produce a well-designed database. The ER Model represents real-world entities and the relationships between them. Creating an ER Model in DBMS is considered as a best practice before implementing your database.

ER Modeling helps you to analyze data requirements systematically to produce a well-designed database. So, it is considered a best practice to complete ER modeling before implementing your database.


History of ER models

ER diagrams are a visual tool which is helpful to represent the ER model. It was proposed by Peter Chen in 1971 to create a uniform convention which can be used for relational database and network. He aimed to use an ER model as a conceptual modeling approach.


Why use ER Diagrams?

Here, are prime reasons for using the ER Diagram

  • Helps you to define terms related to entity relationship modeling

  • Provide a preview of how all your tables should connect, what fields are going to be on each table

  • Helps to describe entities, attributes, relationships

  • ER diagrams are translatable into relational tables which allows you to build databases quickly

  • ER diagrams can be used by database designers as a blueprint for implementing data in specific software applications

  • The database designer gains a better understanding of the information to be contained in the database with the help of ERP diagram

  • ERD Diagram allows you to communicate with the logical structure of the database to users


Facts about ER Diagram Model