'Describing binary relationship sets' diaporamas de présentation

Unit 5 Entity-Relationship Model

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Entity-Relationship Modelling

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Entity-Relationship Modelling

Entity-Relationship Modelling. Entities Attributes Relationships Mapping Cardinality Keys Reduction of an E-R Diagram to Tables. Entity Sets. A database can be modeled as a collection of: entities, and relationships among those entities.

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Chapter 2: Entity-Relationship Model

Chapter 2: Entity-Relationship Model. Entity Sets Relationship Sets Mapping Constraints Keys Participation Constraints E-R Diagram Extended E-R Features Design of an E-R Database Schema Reduction of an E-R Schema to Tables Objective: conceptual DB design using ER diagrams.

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The Entity-Relationship Model

The Entity-Relationship Model. Part-2. 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.

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