Modelling Business Information: Entity Relation... Apr 2026

An Entity-Relationship Model, or ER Model, is a conceptual representation of data that typically evolves through three stages: conceptual, logical, and physical.

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

Introduces specific attributes, primary keys, and foreign keys, mapping out operational data rules without being database-specific. An Entity-Relationship Model, or ER Model, is a

Specific properties describing an entity, such as Customer Name or Product Price . An Entity-Relationship Model

Defines the high-level business scope and key concepts, focusing on business vocabulary rather than technical detail.

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

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