Entity Relationship Diagram Definition
What Are Entity-Relationship Diagrams? In industry-standard ER diagrams, rectangles or squares represent entities, which are tables that hold specific information in a database. Diamonds represent relationships, which are the interactions between the entities. Ovals represent attributes, or data that describes an entity. Although entity-relationship diagrams may look complicated, these diagrams help knowledgeable users understand database structures at a high level without accompanying details. Database designers use ER diagrams to model the relationships between database entities in a clear format....