Relationship between supertypes and subtypes. Where does the rule of disjunction apply?

Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter5: Advanced Data Modeling
Section: Chapter Questions
Problem 5RQ
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 Relationship between supertypes and subtypes. Where does the rule of disjunction apply?

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