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Symbols in ER Diagrams

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Symbols in ER Diagrams

 Rectangle : Entity set
Ellipse  : Attribute
Diamond : Relation
Lines  : links attribute to entity or relation and entities to relations
Double ellipse : multivalued attribute
Dashed ellipse : derived attribute
Double line : total participation of entity in relationship set
Inverted triangle : Links sub-type entities with super-type entity
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