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International Computer Institute, Izmir, Turkey E-R Model

International Computer Institute, Izmir, Turkey E-R Model

International Computer Institute, Izmir, Turkey E-R Model. Asst.Prof.Dr. ?lker Kocaba? UB?502 at http://ube.ege.edu.tr/~ikocabas/teaching/ubi502/index.html. Entity-Relationship Model. Entity Sets Relationship Sets Design Issues Mapping Constraints Keys E-R Diagram Extended E-R Features

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Chapter 2: Entity-Relationship Model (Continued)

Chapter 2: Entity-Relationship Model (Continued)

Chapter 2: Entity-Relationship Model (Continued). Entity-Relationship Diagrams Mapping Constraints Keys & weak entity sets Non-binary relations Extended Features: generalization/specialization & aggregation Design issues. E-R Diagrams. Rectangles represent entity sets.

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562 views • 36 slides
Chapter 2: Entity-Relationship Model (Continued)

Chapter 2: Entity-Relationship Model (Continued)

Chapter 2: Entity-Relationship Model (Continued). Entity-Relationship Diagrams Mapping Constraints Keys & weak entity sets Non-binary relations Extended Features: generalization/specialization & aggregation Design issues. E-R Diagrams. Rectangles represent entity sets.

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491 views • 36 slides
Weak Entity Sets

Weak Entity Sets

Weak Entity Sets. A weak entity is an entity that cannot exist in a database unless another type of entity also exists in that database. Weak entity meets two conditions Existence-dependent Cannot exist without entity with which it has a relationship

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376 views • 35 slides
Weak Entity Sets

Weak Entity Sets

Weak Entity Sets. An entity set that does not have a primary key is referred to as a weak entity set . The existence of a weak entity set depends on the existence of a identifying entity set

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411 views • 25 slides

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