Which of the following operators is used to updated a document partially?

The correct answer is A. $set. $set is MongoDB's partial update operator - it modifies only the specified fields in a document while leaving all other fields untouched, making it the correct choice for a partial update. $update does not exist in MongoDB; it's a common distractor that confuses the operator name

MongoDB Fundamentals

Question

Options

A$set
B$update
C$project
D$modify

How the community answered

(34 responses)

A
88% (30)
B
3% (1)
C
6% (2)
D
3% (1)

Explanation

$set is MongoDB's partial update operator - it modifies only the specified fields in a document while leaving all other fields untouched, making it the correct choice for a partial update.

$update does not exist in MongoDB; it's a common distractor that confuses the operator name with the updateOne()/updateMany() method names. $project is an aggregation pipeline stage used to include or exclude fields in query results, not to modify stored documents. $modify is also not a valid MongoDB operator - it's invented to sound plausible.

Memory tip: Think of $set like setting a value on an object in code (obj.field = value) - you're targeting and changing only what you name, nothing else.

Topics

#$set operator#partial update#update operators

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