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Welcome to the Aggregation Concepts and Aggregation Mechanics MCQs Page

Dive deep into the fascinating world of Aggregation Concepts and Aggregation Mechanics with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Aggregation Concepts and Aggregation Mechanics, a crucial aspect of MongoDB. In this section, you will encounter a diverse range of MCQs that cover various aspects of Aggregation Concepts and Aggregation Mechanics, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within MongoDB.

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Check out the MCQs below to embark on an enriching journey through Aggregation Concepts and Aggregation Mechanics. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of MongoDB.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Aggregation Concepts and Aggregation Mechanics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Aggregation Concepts and Aggregation Mechanics MCQs | Page 10 of 12

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Q91.
Which of the following returns the hour for a date as a number between 0 and 23?

a.

$minute

b.

$hour

c.

$seconds

d.

All of the mentioned

Discuss
Answer: (b).$hour
Q92.
__________ returns the date as a formatted string.

a.

$toString

b.

$dateToString

c.

$letString

d.

None of the mentioned

Discuss
Answer: (b).$dateToString
Q93.
_______ result encompasses instances of undefined values or missing fields.

a.

Number

b.

String

c.

Null

d.

None of the mentioned

Discuss
Answer: (c).Null
Q94.
___________ returns either the non-null result of the first expression.

a.

$Null

b.

$ifNull

c.

$ElseNull

d.

None of the mentioned

Discuss
Answer: (b).$ifNull
Q95.
__________ take as input a single expression, evaluating the expression once for each input document, and maintain their state for the group of documents.

a.

Computer

b.

Monitors

c.

Accumulators

d.

Performoner

Discuss
Answer: (c).Accumulators
Q96.
$sum is an accumulator operator available only in the _______ stage.

a.

$group

b.

$sets

c.

$accumulator

d.

None of the mentioned

Discuss
Answer: (a).$group
Q97.
Point out the wrong statement.

a.

$avg is an accumulator operator available only in the $group stage

b.

$sum accumulator can be used to compute the total amount and count for each group of documents

c.

$avg ignores numeric values

d.

All of the mentioned

Discuss
Answer: (c).$avg ignores numeric values
Q98.
Which of the following ignores non numeric values?

a.

$order

b.

$sum

c.

$asc

d.

None of the mentioned

Discuss
Answer: (b).$sum
Q99.
When using $first in a $group stage, the $group stage should follow a _______ stage to have the input documents in a defined order.

a.

$order

b.

$sort

c.

$asc

d.

None of the mentioned

Discuss
Answer: (b).$sort
Q100.
Which of the following returns the value that results from applying an expression to the last document?

a.

$end

b.

$last

c.

$max

d.

All of the mentioned

Discuss
Answer: (b).$last
Page 10 of 12

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