MongoDB MongoDB Query Language and Operators 2

Question 1

What does the $exists operator check in a MongoDB query?

Accepted Answer

Whether a specified field is present in the document

Answer

$exists matches documents that contain (or do not contain) the specified field, regardless of its value.

Question 2

Which MongoDB operator enables full-text search on fields that have a text index?

Accepted Answer

$text

Answer

$text performs a text search on the content of fields indexed with a text index.

Question 3

What does the $or operator return in a MongoDB query?

Accepted Answer

Documents where at least one condition is true

Answer

$or performs a logical OR, returning documents that satisfy at least one of the given conditions.

Question 4

Which MongoDB operator matches documents where a field value matches a given regular expression pattern?

Accepted Answer

$regex

Answer

$regex selects documents where field values match the specified regular expression.

Question 5

What does the $type operator do in a MongoDB query?

Accepted Answer

Matches documents where a field is of a specified BSON type

Answer

$type selects documents where the value of a field matches the specified BSON type.

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