E-R Model Notation
Entity Relationship Model is invented by Dr. Peter Chen with unique Notation is called Chen's Notation that helps to design Conceptual and Logical Data Model.
Bachman, Crow's Foot and IDEFIX are different Information Engineering Notation that helps to design Data Architecture.
The following image is re-presenting you about Entity, Relationship, Attribute and Degree of Relationship with Chen's Notations.
The following image is re-presenting you about Connectivity and Cardinality, Types of Relationships and Generalization Entity Relationship with Chen's Notations.
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