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Projections In Mongodb

In this article, we will discuss projections in MongoDB.

Purpose

Projections in MongoDB allow you to select the required data from the document rather than the whole data from the document.

Example

While querying a document using the find method, we specify the flag as 0 (zero) for those fields we do not want to fetch.

Consider the following table: -

Picture showing the list of documents using the find method

Click to Enlarge

Our requirement is to fetch only the subject field, not the _id field. So, we will use the following query: -

db.Articles.find({}, {subject:1, _id:0})

Output

Picture showing getting the subset of fields using the MongoDB projections

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, March 17, 2023

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