Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
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Question 656
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The E-R model is expressed in terms of :
(i) Entities
(ii) The relationship among entities
(iii) The attributes of the entities
Then
(i) Entities
(ii) The relationship among entities
(iii) The attributes of the entities
Then
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(i) and (iii)
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(i) and (ii)
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(ii) and (iii)
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None of the above
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Question 656 Explanation:
The E-R model is expressed in terms of:
Entities: An entity is a object in Database. An entity is expressed using a rectangular box in an E-R diagram. Example: person, car etc.
Attributes: Nouns which describe nouns. Attributes helps to describe an entity in a better way.
Example: If person is an entity then person name, address, phone number can be its attributes.
Relationship: Any verb which you are going to describe. Example: A person owns a car. Here “owns” is a verb describing relationship between two entities(person and car).
In above diagram Person and Car are two entities
“owns” is defining the relationship between Person and Car.
name, address are the attributes of “Person” entity and number and model are the attributes of “Car” entity.
Note: Excluded for evaluation, Given wrong options.
Entities: An entity is a object in Database. An entity is expressed using a rectangular box in an E-R diagram. Example: person, car etc.
Attributes: Nouns which describe nouns. Attributes helps to describe an entity in a better way.
Example: If person is an entity then person name, address, phone number can be its attributes.
Relationship: Any verb which you are going to describe. Example: A person owns a car. Here “owns” is a verb describing relationship between two entities(person and car).
In above diagram Person and Car are two entities
“owns” is defining the relationship between Person and Car.
name, address are the attributes of “Person” entity and number and model are the attributes of “Car” entity.
Note: Excluded for evaluation, Given wrong options.
Correct Answer: D
Question 656 Explanation:
The E-R model is expressed in terms of:
Entities: An entity is a object in Database. An entity is expressed using a rectangular box in an E-R diagram. Example: person, car etc.
Attributes: Nouns which describe nouns. Attributes helps to describe an entity in a better way.
Example: If person is an entity then person name, address, phone number can be its attributes.
Relationship: Any verb which you are going to describe. Example: A person owns a car. Here “owns” is a verb describing relationship between two entities(person and car).
In above diagram Person and Car are two entities
“owns” is defining the relationship between Person and Car.
name, address are the attributes of “Person” entity and number and model are the attributes of “Car” entity.
Note: Excluded for evaluation, Given wrong options.
Entities: An entity is a object in Database. An entity is expressed using a rectangular box in an E-R diagram. Example: person, car etc.
Attributes: Nouns which describe nouns. Attributes helps to describe an entity in a better way.
Example: If person is an entity then person name, address, phone number can be its attributes.
Relationship: Any verb which you are going to describe. Example: A person owns a car. Here “owns” is a verb describing relationship between two entities(person and car).
In above diagram Person and Car are two entities
“owns” is defining the relationship between Person and Car.
name, address are the attributes of “Person” entity and number and model are the attributes of “Car” entity.
Note: Excluded for evaluation, Given wrong options.