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$Exists In Mongodb

In this article, we will discuss the $exists operator in MongoDB.

Purpose

The $exists operator checks if a particular field exists in the document.

Syntax

db.[collection_name].find(
{
         [field]:{$exists:false
 }
}) -- returns the document(s) that does that contain the field

db.[collection_name].find(
{
         [field]:{$exists:true
 }
}) -- returns the document(s) that contains the field

Example

Consider the following collection: -

Picture showing the sample collection in mongodb

In the above collection, we will execute 2 queries i.e., documents where the age field does not exist and documents where the age field exists.

Picture showing the output of $exists operator in mongodb

Posted By -	Karan Gupta

Posted On -	Monday, March 4, 2024

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