Exam (elaborations)
SER322 QUIZ – ER MODELING TEST QUESTIONS AND ANSWERS
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SER322 QUIZ – ER MODELING TEST QUESTIONS AND ANSWERS...
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SER322 QUIZ – ER MODELING TESTQUESTIONS AND ANSWERS
What is a Composite attribute?
a) An attribute that represents a value that is derivable from a related
attribute or set of attributes, not necessarily in the same entity
b) An attribute that holds multiple values for a single component
c) An attribute composed of multiple components each with individual
existence
d) An attribute that holds a single value for a single entity
e) An attribute composed of a single component with an independent
existence - ANSWER c) An attribute composed of multiple components
each with individual existence
A condition that an entity can be a member of at most one of the
subclasses of the specialization is called ______________.
a) completeness constraint
b) overlapping constraint
c) disjointness constraint
d) predicate constraint - ANSWER c) disjointness constraint
A condition that every entity in the superclass must be a member of
some subclass in the specialization/ generalization is called
______________.
a) completeness constraint
b) disjointness constraint
c) overlapping constraint
d) predicate constraint - ANSWER a) completeness constraint
An entity is ____________.
a) an inanimate object in an application
b) a collection of items in a mini-world
c) a distinct object or thing in a mini-world
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