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When looking into the extended entity - relationship model ( EERM ) , which of the following statements is not valid about entity supertypes and
When looking into the extended entityrelationship model EERM which of the following statements is not valid about entity supertypes and subtypes?
The entity subtype contains common characteristics:
Entity supertype and subtype are based on a hierarchical structure.
The entity supertype contains common characteristics with subtype.
An entity supertype is a generic entity type related to one or more entity subtypes.
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