SER 322 Midterm Exam | Questions and Answers (Complete Solutions)
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Course
SER 322
Institution
SER 322
SER 322 Midterm Exam | Questions and Answers (Complete Solutions) 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 comp...
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
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
A condition that an entity can be a member of more than one of the subclasses of the
specialization is called ______________.
A. completeness constraint
B. overlapping constraint
C. disjointness constraint
D. predicate 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. overlapping constraint
,C. disjointness constraint
D. predicate 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
D. data structure
An entity that does not have sufficient attributes to form a primary key is termed a
__________.
A. Variant
B. Strong entity
C. Weak entity
D. Variable
In an E-R diagram entities are represented by _______________.
A. diamond shaped box
B. circles
C. ellipse
D. rectangles
In an E-R diagram Attributes are represented by _______________.
A. diamond shaped box
B. circles
C. ellipse
D. rectangles
, In an E-R diagram Attributes are represented by _______________.
A. diamond shaped box
B. circles
C. ellipse
D. rectangles
In an E-R diagram Relationship Set are represented by _______________.
A. diamond shaped box
B. circles
C. ellipse
D. rectangles
A double rectangle represents a:
Weak Set
Relationship types of degree 3 are called _______________.
A. ternary
B. binary
C. n-ary
Suppose:
VEHICLE is a superclass{CAR, TRUCK} are subclasses of VEHICLEVEHICLE is a
_____________________of {CAR, TRUCK}.
A. union-type
B. specialization
C. generalization
D. category
What is Specialization?
A. the process of defining a set of subclasses of a superclass
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