When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following? Overlap with total specialization Disjoint with total specialization Overlap with partial specialization Disjoint with partial specialization TRUE ANSWER : ? YOUR ANSWER : ?
A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s). True False TRUE ANSWER : ? YOUR ANSWER : ?
Packaged data models are meant to be exactly right straight out of the box. False True TRUE ANSWER : ? YOUR ANSWER : ?
Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied. True False TRUE ANSWER : ? YOUR ANSWER : ?
An entity cluster is a set of one or more entity types and associated relationships. False True TRUE ANSWER : ? YOUR ANSWER : ?
An entity instance of a subtype represents the same entity instance of a supertype. True False TRUE ANSWER : ? YOUR ANSWER : ?
It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type. True False TRUE ANSWER : ? YOUR ANSWER : ?
A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings. True False TRUE ANSWER : ? YOUR ANSWER : ?
Use of a supertype/subtype relationship is necessary when which of the following exists? An instance of a subtype participates in a relationship that is the same as the other subtypes. An instance of a subtype participates in a relationship that is unique to that subtype. Attributes apply to all of the instances of an entity type. No attributes apply to any of the instances of an entity type. TRUE ANSWER : ? YOUR ANSWER : ?
An oval represents which of the following in an EER? Attribute Entity Relationship Optional One TRUE ANSWER : ? YOUR ANSWER : ?