What is ERD , definitions of entities , attributes , cardinalates , relationships.
WHAT IS ERD? ERD stands for Entity-Relationship Diagram, a graphical representation of entities, attributes, and relationships in a data model. The purpose of an ERD is to help design and visualize a database schema in a clear and organized way. Meaning of the terms related to the ERD . Attributes - it is a vivid property of an entity .for example 'customer' entity might have attributes such as (" name, address and phone numbers"). it is represented by an oval and it is attached to entity(Brady.M,2010). Entities- an ERD, an entity is represented by a rectangle, and its name is written inside it. For example, "Customer" is an entity that might be included in a database scheme. An entity is a concept or object in the real world that can be identified and described.(Song,1995). Relationships - it is connection between two or more entities , it is represented by diamond and always described by a verb. or example, a "Customer" entity might have a rel...