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Projections In Mongodb

In this article, we will discuss projections in MongoDB.

Purpose

Projections in MongoDB enable you to precisely select only the data you need from a document, rather than retrieving the entire 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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