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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 C OMPLETENESS CONSTRAINTS .............................................................................................................. 1 2.2 D ISJOINTNESS CONSTRAINTS ................................................................................................................ 1 2.3 S UBTYPE DISCRIMINATORS ................................................................................................................... 1 2.4 S UBTYPE AND SUPERTYPE HIERARCHIES ............................................................................................... 1
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