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Showing posts with the label what is DIAMOND in ERD

Symbols in ER Diagrams

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