Modelling Business Information: - Entity Relation...

Introduces specific attributes, primary keys, and foreign keys, mapping out operational data rules without being database-specific.

Countable objects, concepts, or events, such as Customer , Product , or Order . Modelling Business Information: Entity relation...

Defines the numerical context of relationships, such as One-to-One (1:1), One-to-Many (1:N), or Many-to-Many (M:N). The Three Levels of Data Modelling The Three Levels of Data Modelling The associations

The associations between entities, such as a Customer "places" an Order . Introduces specific attributes

Provides enough detail for database developers to build the actual system, including technical data types. Benefits of Entity-Relationship Modeling What is an Entity Relationship Diagram (ERD)? - Lucidchart

Modelling Business Information using Entity-Relationship (ER) diagrams is a foundational technique for defining the structure, relationships, and rules of data within an organization . It acts as a bridge between business requirements and technical database design, enabling stakeholders to visualize the "things" (entities) a business cares about and how they interact. Core Components of ER Modelling