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Aggregate Functions DBMS Questions And Answers

Here you can find Aggregate Functions DBMS Questions and Answers.

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Aggregate Functions DBMS Questions & Answers

1. Aggregate Functions DBMS are functions that take a ___________ as input and return a single value.

Aggregate Functions DBMS Questions & Answers

2. Select __________ from instructor where dept name= ’Comp. Sci.’;Which of the following should be used to find the mean of the salary ?

Aggregate Functions DBMS Questions & Answers

3. All Aggregate Functions DBMS except _____ ignore null values in their input collection.

Aggregate Functions DBMS Questions & Answers

4. A Boolean data type that can take values true, false, and________ .

Aggregate Functions DBMS Questions & Answers

5. Select count (____ ID) from teaches where semester = ’Spring’ and year = 2010; If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.

Aggregate Functions DBMS Questions & Answers

6. The ____ connective tests for set membership, where the set is a collection of values produced by a select clause. The ____ connective tests for the absence of set membership.

Aggregate Functions DBMS Questions & Answers

7. We can test for the nonexistence of tuples in a subquery by using the _____ construct.

Home EngineeringComputer Science & EngineeringDBMS Questions and AnswersAggregate Functions

Aggregate Functions - DBMS Questions and Answers

This is the DBMS questions and answers section on "Aggregate Functions" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand. We are here to provide the Aggregate Functions DBMS Questions on the various topics. The Aggregate Functions DBMS MCQ Quiz will consist of all the questions of the Aggregate Functions topic. Thus, the applicants can test your skills with the help of the Aggregate Functions DBMS Online Test. The competitors can refer to the Aggregate Functions DBMS Quiz to know different type of questions and answers. All the Aggregate Functions DBMS Questions we have presented will help you to attend the interview with knowledge on the Aggregate Functions Topic. The candidates need to practice the given Aggregate Functions DBMS Mock Test and learn the concept of the Aggregate Functions.



Aggregate Functions DBMS Questions - Aggregate Functions DBMS Quiz Details

Online Test Name Aggregate Functions
Exam Type Multiple Choice Questions
Category Computer Science Engineering Quiz
Number of Questions 07


In Database Management an aggregate function is a function where the values of the multiple rows are grouped together to form a single value of more significant meaning or measurements such as a set, a bag or a list. To answer the Aggregate Functions DBMS Questions, the applicants need to know the fundas of the topic. By referring to the Aggregate Functions DBMS Quiz the aspirants can learn many more different questions along with the answers. Therefore, without any delay, the competitors need to take part in the Aggregate Functions DBMS MCQ Online Test.



Aggregate Functions DBMS Multiple Choice Questions

In the above tabular format, we have provided the information about the Aggregate Functions DBMS Quiz. Before taking part in the online test, all the aspirants need to know the outline of it. There is no time limit to practice the Aggregate Functions DBMS Questions form this article. Thus, the students can spend their own time to prepare the questions related to the Aggregate Functions in DBMS. Check the below-provided Aggregate Functions DBMS Questions and candidates need to improve the logical skills. The individuals can increase the knowledge in DBMS by practicing the provided online tests.

Aggregate Functions MCQ Quiz Answers with Solutions

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1. Aggregate functions are functions that take a ___________ as input and return a single value.
  • A. Collection of values
  • B. Single value
  • C. Aggregate value
  • D. Both a & b
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Answer & Explanation

Answer: Option A

Explanation:

Collection of values

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2. Select __________ from instructor where dept name= ’Comp. Sci.’;
Which of the following should be used to find the mean of the salary ?
  • A. Mean(salary)
  • B. Avg(salary)
  • C. Sum(salary)
  • D. Count(salary)
  • View Answer
  • Workspace
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  • Discuss

Answer & Explanation

Answer: Option B

Explanation:

Avg(salary)

Avg() is used to find the mean of the values.

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3. All aggregate functions except _____ ignore null values in their input collection.
  • A. Count(attribute)
  • B. Count(*)
  • C. Avg
  • D. Sum
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Answer & Explanation

Answer: Option B

Explanation:

Count(*)

* is used to select all values including null.

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4. A Boolean data type that can take values true, false, and________ .
  • A. 1
  • B. 0
  • C. Null
  • D. Unknown
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Answer & Explanation

Answer: Option D

Explanation:

Unknown

Unknown values do not take null value but it is not known.

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5. Select count (____ ID)
from teaches
where semester = ’Spring’ and year = 2010;
If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.
  • A. Distinct
  • B. Count
  • C. Avg
  • D. Primary key
  • View Answer
  • Workspace
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  • Discuss

Answer & Explanation

Answer: Option A

Explanation:

Distinct

Distinct keyword is used to select only unique items from the relation.

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