(DER). A DER is a system modeling tool, which focuses on the data stored in the system and the relationships between them.
An entity-relationship diagram or RED is a network model that describes the distribution of data stored in a system in an abstract way.
Some bibliographies differentiate between the entity-relationship diagram and the entity-relationship model, where the entity-relationship model would be the «language» used to create entity-relationship diagrams. More information on entity-relationship model.
Components of a RED
* TYPES OF OBJECTS or ENTITIES.
* RELATIONSHIPS: connect objects or entities.
computer systems development
DERs are used to model databases that belong to a computer system.
Related:
• Modeling tools.
• Entity-relationship model.
Quote the definition:
Alegsa.com.ar (2016). entity relationship diagram definition – ALEGSA url: https:///Dic/entity-relationship diagram.php
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