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Database Systems: Concepts, Design and Applications by S. K. Singh

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State True/False

1.Subclasses are the sub-grouping of occurrences of entities in an entity type that shares common attributes or relationships distinct from other sub-groupings.
2.In case of supertype, objects in one set are grouped or subdivided into one or more classes in many systems.
3.Superclass is a generic entity type that has a relationship with one or more subtypes.
4.Each member of the subclass is also a member of the superclass.
5.The relationship between a superclass and a subclasses is a one-to-many (1:N) relationship.
6.The U-shaped symbols in ERR model indicates that the supertype is a subset of the subtype.
7.Attribute inheritance is the property by which supertype entities inherit values of all attributes of the subtype.
8. ...

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