Database Organization

Semantic Objects

H.8 Give an example of each of the following:

A. A simple, single-value attribute

B. A group, single-value attribute

C. A simple, multivalue attribute

D. A group, multivalue attribute

E. A simple object attribute

F. A multivalued object attribute .

H.23 Give an example of an association and related objects, other than one in this text. Show how to represent these objects by means of relations. Assume that the association object has an identifier of its own.

H.25 Give an example of a parent object with at least two exclusive subtypes. Show how to represent these objects by means of relations. Use a type indicator attribute.

H.27 Find an example of a form on your campus that would be appropriately modeled with a simple object. Show how to represent this object by means of a relation.

H.28 Find an example of a form on your campus that would be appropriately modeled with a composite object. Show how to represent this object by means of relations.