E-R model: It is a tool for creating data model. It is used for developers to describe the content of data model by using two functions called entities and relationships. Entity: It helps the user for tracking something in database . Example entities in student database system are Student, Grade, Course, etc. Relationships: Entities have relationships among each other. For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor. Attribute: It used to describe the entity characteristics. Example attributes of student entity is Student_id, Student_name, Student_address, etc. Identifier: It is an attribute or group of attribute, but its value is related with one and only one entity instance. Example of E-R diagram:

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Answer 1

Question

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

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Direct connections between the database and external entities are not allowed. This is one of the design ideas for data flow diagrams to take into account. What is implied by this advice?

Answer 2

Question

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Expert Solution & Answer

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Answer 4

Question

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Expert Solution & Answer

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Answer 5

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Answer 6

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Answer 7

Chapter 5, Problem 5.3UYK

Program Plan Intro

E-R model:

It is a tool for creating data model.

It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

It helps the user for tracking something in database.

Example entities in student database system are Student, Grade, Course, etc.

Relationships:

Entities have relationships among each other.

For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

It used to describe the entity characteristics.

Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 5.2 - Prob. 1EGDQ Ch. 5.2 - Prob. 2EGDQ Ch. 5.2 - Prob. 3EGDQ Ch. 5.2 - Prob. 4EGDQ Ch. 5.2 - Prob. 5EGDQ Ch. 5.2 - Prob. 6EGDQ Ch. 5.2 - Prob. 7EGDQ Ch. 5.2 - Consider the adage Never ask a question for which...Ch. 5.3 - Prob. 1SAQ Ch. 5.3 - Prob. 2SAQ

Solution Summary: The author describes E-R model as a tool for developers to describe the content of data model by using entities and relationships.

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Chapter 5 Solutions