'Strong entity type' diaporamas de présentation

Data Modeling is an Analysis Activity

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Chapter 11

Chapter 11. Entity-Relationship modeling Transparencies. Chapter 11 - Objectives. The use of high-level conceptual data models to support database design. The basic concepts associated with the Entity-Relationship (ER) model, a high-level conceptual data model.

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Remember

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Fundamentals/ICY: Databases 2013/14 Week 5: Friday (slides added at front on the day)

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Review Database Application Development

Review Database Application Development. ER-diagram. Forms. Access Database Development. Reports. Queries. ER-diagram. Entity types Strong entity type Weak entity type Relationships Cardinality constraints Participation constraints Attributes atomic attributes

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Weak Entity Types

Weak Entity Types. CSCI 6442. Most entity types are strong entity types, that exist independently from other entity types A strong entity type always has a unique identifier that distinguishes each occurrence of that entity type A weak entity type needs another entity type for its identifier

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