Database Test 4 Computer Subject
Database Test 4 Computer Subject
Question 11
Which of the following relate two or more other objects?
Association objects are used to relate two or more other objects.
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Question 12
Which of the following are used to represent the specialization of objects?
Subtype objects represent specialization or a subset of objects with specific characteristics.
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Question 13
Which of the following are used to model objects that contain base data along with multiple variations, or versions?
Archtype objects model objects that maintain base data along with multiple variations or versions.
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Question 14
How are the E-R model and the semantic object model similar?
Both E-R and semantic object models are tools for understanding and documenting the structure of users' data.
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Question 15
The principle difference between the E-R model and the semantic model is?
The main difference is that E-R models take entities as basic, whereas semantic object models take semantic objects as basic.
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Question 16
Attributes which have a single element are called:
Single-element attributes are called simple attributes.
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Question 17
One or more object attributes that the users employ to identify object instances is/are called?
Object identifiers are used to uniquely identify instances using one or more object attributes.
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Question 18
Which of the following is a description of an attribute's possible values?
A domain defines the possible values an attribute can take.
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Question 19
Which of the following is an identifier that has more then one attribute?
Group identifiers are identifiers that include more than one attribute to uniquely identify an instance.
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Question 20
The set of an attribute's specific values is called?
An enumerated list is the set of specific values an attribute can take.
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