Drawing ER and EER Diagrams & Relational Mapping
A comprehensive introduction to ER & EER Hi Readers!😍 Today I am going to tell you how to draw ER and EER diagrams for your database and how to map them into relational schemas.🤞 Before that here are some things you should know. First Lets see what are ER and EER diagrams. What are the ER diagrams? ER diagram is a visual representation of data based on the ER model , and it describes how entities are related to each other in the database. What are EER diagrams? EER diagram is a visual representation of data, based on the EER model that is an extension of the original entity-relationship ( ER ) model . When you read this article you will find these words. ”Entity, Attribute, Relationship, Cardinality, and Participation” .🤔 Okay, Let’s see what are these. Entity An entity is any singular, identifiable and separate object. It refers to individuals, organizations, systems, bits of data or even distinct system components that are considered significant in and of themselve