BUS-S307 Chapter 4 Review

BUS-S307 Chapter 4 Review - The Enhanced E-R Model 1...

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The Enhanced E-R Model 1 CONCEPT AND NOTATIONS . .............................................................................................................. 1 2 SPECIFYING CONSTRAINTS IN SUPERTYPE/SUBTYPE RELATIONSHIP . ............................. 1 2.1 COMPLETENESS CONSTRAINTS . ............................................................................................................. 1 2.2 DISJOINTNESS CONSTRAINTS . ............................................................................................................... 1 2.3 SUBTYPE DISCRIMINATORS . .................................................................................................................. 1 2.4 SUBTYPE AND SUPERTYPE HIERARCHIES . .............................................................................................. 1
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S307 ( Data Management ): Chapter 4 Page 1 of 1 Supertype and subtype allow us to model a general entity type (called the supertype ) and then subdivide it into several specialized entity types called
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BUS-S307 Chapter 4 Review - The Enhanced E-R Model 1...

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