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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 11 of 12

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Q101.
__________ returns the highest value from the group of values in documents.

a.

$end

b.

$last

c.

$max

d.

$maximum

Discuss
Answer: (c).$max
Q102.
Which of the following is syntax for calculating minimum value?

a.

{ $minimum: <int> }

b.

{ $min: <expression>}

c.

{ $minimum: <expression> }

d.

None of the mentioned

Discuss
Answer: (b).{ $min: <expression>}
Q103.
If all documents for the $min operation have null value for the field or are missing the field, the $min operator returns ____ for the minimum value.

a.

1

b.

0

c.

null

d.

none of the mentioned

Discuss
Answer: (c).null
Q104.
$addToSet returns an array of all _______ values that results from applying an expression to each document.

a.

unique

b.

non unique

c.

distinct

d.

all of the mentioned

Discuss
Answer: (a).unique
Q105.
__________ references the root document, i.e. the top-level document, currently being processed in the aggregation pipeline stage.

a.

CURRENT

b.

ROOT

c.

PRUNE

d.

All of the mentioned

Discuss
Answer: (b).ROOT
Q106.
Point out the wrong statement.

a.

Variables can hold any BSON type data

b.

Aggregation expressions can use both user-defined and system variables

c.

To access the value of the variable, use a string with the variable name prefixed with double dollar signs ($$)

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q107.
Which of the operator is similar to order by clause in RDBMS?

a.

$sort

b.

$match

c.

$sortby

d.

None of the mentioned

Discuss
Answer: (a).$sort
Q108.
Which of the following provides similar functionality to join?

a.

$unwindelem

b.

$unwind

c.

$unwin

d.

None of the mentioned

Discuss
Answer: (c).$unwin
Q109.
Point out the wrong statement.

a.

CURRENT references the start of the field path being processed in the aggregation pipeline stage

b.

All stages start with CURRENT the same as ROOT

c.

DESCENDING is one of the allowed results of a $let expression

d.

None of the mentioned

Discuss
Answer: (c).DESCENDING is one of the allowed results of a $let expression
Q110.
________ limits the number of documents in result set.

a.

$project

b.

$geo

c.

$limit

d.

None of the mentioned

Discuss
Answer: (c).$limit
Page 11 of 12

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