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
Defines the high-level business scope and key concepts, focusing on business vocabulary rather than technical detail.
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: Entity relation...
Specific properties describing an entity, such as Customer Name or Product Price .
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 Defines the numerical context of relationships, such as
The associations between entities, such as a Customer "places" an Order .
Countable objects, concepts, or events, such as Customer , Product , or Order . Benefits of Entity-Relationship Modeling What is an Entity
Introduces specific attributes, primary keys, and foreign keys, mapping out operational data rules without being database-specific.