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Isa relationship types - PowerPoint PPT Presentation

The Entity-Relationship Model

The Entity-Relationship Model. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. Part II. Entities with Different Attribute Types (Recap). Multivalued Attribute: major. Primitive Attribute: sNumber. Composite Attribute: address. Student entity type with all its attributes. DoB. Age.

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The Entity-Relationship Model

The Entity-Relationship Model. Part-3. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. More Elements in ER Model. Key Constraints Cardinality Constraints Weak Entities Subclass Entities (ISA Relationships) Principles for Good Design. Weak Entity Sets.

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Isa relationship types - PowerPoint PPT Presentation

The Entity-Relationship Model

The Entity-Relationship Model