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COP 4708 Midterm Exam Questions with Correct Answers
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COP 4708 Midterm Exam Questions with Correct Answers
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COP 4708 Midterm Exam Questions withCorrect Answers
An identifier may be - Answer-composite
A for-use-by pattern must involve what kind of entity? - Answer-Supertype entity
An identifier of an entity instance must consist of one and only one attribute. - Answer-
False
For a relationship to be considered a binary relationship it must satisfy which of the
following conditions? - Answer-It must involve exactly two entity classes.
In today's E-R- models, attributes of relationships are still used - Answer-False
A single relationship class involves only one entity class - Answer-False
Relationships are classified by their cardinality - Answer-True
To represent an archetype/instance pattern in an E-R model, ________. - Answer-
create a new ID-dependent entity with a 1:N relationship
An entity's minimum carnality in a relationship indicates the number of entity instances
that must participate in the relationship - Answer-True
In an E-R model, the three types of maximum cardinality are 1:1, 1:N, and N:M -
Answer-True
Discriminators can be ________. - Answer-attributes
One example of a database design using an ID-dependent relationship is the
archetype/instance pattern - Answer-True
An entity whose existence depends on the presence of another entity but whose
identifier does not include the identifier of the other entity is a(n) ________. - Answer-
weak entity
All database applications send and receive database data by sending SQL statements
to the DBMS. - Answer-True
Indexes are data structures that speed database searches. - Answer-True
A Customer Resource Management (CRM) system is an example of a(n) ________. -
Answer-multiuser database application
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