Introduction to Computing MCQs with Answers

Chapter: 154

Q2181:

Fill in the blank: The lack of efficiency due to redundancy in a relational database can lead to multiple tuples containing the same __________.

A. Employee identification number

B. Job title

C. Skill code

D. Job identification code

Correct Answer: A

Chapter: 154

Q2182:

Fill in the blank: To avoid losing job-related information when an employee is deleted, the relational database design should include a separate __________ relation.

A. Employee

B. Job

C. Assignment

D. Department

Correct Answer: B

Chapter: 154

Q2183:

Fill in the blank: Combining employee, job, and assignment information into a single relation can cause issues with __________.

A. Database performance

B. Data integrity

C. Complexity

D. Redundancy

Correct Answer: D

Chapter: 155

Q2184:

What operation is used to retrieve specific tuples from a relation?

A. Projection

B. Selection

C. Joins

D. Union

Correct Answer: B

Chapter: 155

Q2185:

What does selecting tuples with a certain department from the JOB relation result in?

A. A relation containing one tuple

B. A relation containing several tuples

C. A relation with no tuples

D. A relation with duplicate tuples

Correct Answer: B

Chapter: 155

Q2186:

When retrieving information about an employee from the EMPLOYEE relation, what is the result?

A. A relation with several tuples

B. A relation with no tuples

C. A relation with one tuple

D. A relation with a summary of data

Correct Answer: C

Chapter: 155

Q2187:

Which relational operation would be used to obtain a list of job titles in a certain department?

A. Projection

B. Selection

C. Joins

D. Union

Correct Answer: B

Chapter: 155

Q2188:

What is the primary purpose of the SELECT operation in relational databases?

A. To combine tuples from multiple relations

B. To retrieve specific tuples based on criteria

C. To update existing tuples

D. To delete tuples

Correct Answer: D

Chapter: 155

Q2189:

Fill in the blank: When you select tuples from a relation based on a certain attribute value, you create a new __________ that consists of tuples meeting the criteria.

A. Relation

B. Table

C. View

D. Subset

Correct Answer: B

Chapter: 155

Q2190:

Fill in the blank: Retrieving all job titles from the JOB relation for a given department results in a relation with __________ tuples.

A. No

B. One

C. Multiple

D. Zero

Correct Answer: C

Chapter: 155

Q2191:

Fill in the blank: The outcome of selecting information about a specific employee from the EMPLOYEE relation will always be a relation containing __________.

A. Multiple tuples

B. A summary of data

C. One tuple

D. No tuples

Correct Answer: C

Chapter: 155

Q2192:

Which operation retrieves all tuples from a relation where a specific condition is met?

A. Projection

B. Selection

C. Joins

D. Aggregation

Correct Answer: B

Chapter: 155

Q2193:

What is an example of a condition you might use in a SELECT operation on the JOB relation?

A. Employee's age

B. Job identification code

C. Employee's name

D. Department attribute

Correct Answer: B

Chapter: 155

Q2194:

What kind of relation is formed when specific tuples are selected from a parent relation?

A. A temporary relation

B. A permanent relation

C. A view

D. A summary

Correct Answer: D

Chapter: 156

Q2195:

What does the SELECT operation in relational databases do?

A. It retrieves all tuples from a relation

B. It creates a new relation with selected tuples

C. It updates existing tuples in a relation

D. It deletes tuples from a relation

Correct Answer: B

Chapter: 156

Q2196:

In the statement `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'`, what is the purpose of `NEW`?

A. It specifies the relation to be updated

B. It specifies the relation to be deleted

C. It specifies the new relation created from the selection

D. It specifies the relation from which tuples are selected

Correct Answer: C

Chapter: 156

Q2197:

What will be the content of the `NEW` relation after executing `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'`?

A. Tuples matching the condition

B. All tuples from EMPLOYEE

C. No tuples

D. Partial tuples matching the condition

Correct Answer: A

Chapter: 156

Q2198:

Which attribute is used in the SELECT operation to filter tuples in the given example?

A. EmplName

B. EmplAddress

C. EmplId

D. EmplDept

Correct Answer: C

Chapter: 156

Q2199:

What does the SELECT operation in the example `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'` focus on?

A. Filtering tuples based on an attribute

B. Joining relations

C. Updating tuples

D. Deleting tuples

Correct Answer: A

Chapter: 156

Q2200:

Fill in the blank: The result of the SELECT operation `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'` will be a relation containing tuples where __________.

A. The EmplId attribute is not equal to '34Y70'

B. The EmplId attribute is equal to '34Y70'

C. The EmplId attribute is greater than '34Y70'

D. All tuples in EMPLOYEE

Correct Answer: B

Introduction to Computing MCQs with Answers

Fill in the blank: The lack of efficiency due to redundancy in a relational database can lead to multiple tuples containing the same __________.

Fill in the blank: To avoid losing job-related information when an employee is deleted, the relational database design should include a separate __________ relation.

Fill in the blank: Combining employee, job, and assignment information into a single relation can cause issues with __________.

What operation is used to retrieve specific tuples from a relation?

What does selecting tuples with a certain department from the JOB relation result in?

When retrieving information about an employee from the EMPLOYEE relation, what is the result?

Which relational operation would be used to obtain a list of job titles in a certain department?

What is the primary purpose of the SELECT operation in relational databases?

Fill in the blank: When you select tuples from a relation based on a certain attribute value, you create a new __________ that consists of tuples meeting the criteria.

Fill in the blank: Retrieving all job titles from the JOB relation for a given department results in a relation with __________ tuples.

Fill in the blank: The outcome of selecting information about a specific employee from the EMPLOYEE relation will always be a relation containing __________.

Which operation retrieves all tuples from a relation where a specific condition is met?

What is an example of a condition you might use in a SELECT operation on the JOB relation?

What kind of relation is formed when specific tuples are selected from a parent relation?

What does the SELECT operation in relational databases do?

In the statement `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'`, what is the purpose of `NEW`?

What will be the content of the `NEW` relation after executing `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'`?

Which attribute is used in the SELECT operation to filter tuples in the given example?

What does the SELECT operation in the example `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'` focus on?

Fill in the blank: The result of the SELECT operation `NEW <- SELECT from EMPLOYEE where EmplId = '34Y70'` will be a relation containing tuples where __________.

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