Database Test 2 Computer Subject
Database Test 2 Computer Subject
Question 31
An identifier may be______?
Identifiers can be composite, unique, or non-unique depending on how they uniquely identify entity instances.
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Question 32
Entities can be associated with one another in which of the following _____?
Relationships define how entities are associated or connected with each other.
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Question 33
The relationship can be:
Relationships in an ERD can be one-to-one, one-to-many, or many-to-many depending on entity associations.
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Question 34
In which of the following is a single entity instance of one type related to a single entity instance of another type?
A one-to-one relationship links a single instance of one entity to a single instance of another entity.
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Question 35
In which of the following is a single entity instance of one type related to many entity instances of another type?
A one-to-many relationship links a single instance of one entity to multiple instances of another entity.
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Question 36
In which of the following can many entity instances of one type be related to many entity instances of another type?
A many-to-many relationship allows multiple instances of one entity type to be associated with multiple instances of another type.
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Question 37
Which of the following is an example of one to one relationship?
A student-registration number uniquely identifies one student, representing a one-to-one relationship.
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Question 38
Which of the following is an example of one to many relationship?
One person can have multiple automobiles or one mother can have multiple daughters, making both examples one-to-many relationships.
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Question 39
A relationship between countries and capitals is an example of ________ relationship.
Each country has only one capital, so it is a one-to-one relationship.
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Question 40
Which of the following is related to modality?
Modality defines whether participation in a relationship is optional or mandatory.
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