Both are used to represent interrelated things of interest (entities) in a specific domain of knowledge
- Entity-Relationship Model (ERM) - was introduced by Peter Chen in 1976 (see first and second articles)
- Entity-Relationship Diagram (ERD) - is a type of diagram used to represent ERM (e.g. Data Models)
ERD Notation Techniques
|
|
---entity-relationship-diagram-(erd)/er-notation-techniques-comparison.png)