Articles → MONGODB → $Out Aggregation Operator In Mongodb

$Out Aggregation Operator In Mongodb

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

Purpose

The $out stage is used in aggregation pipelines to write the results of the aggregation query to a collection.

Example

Consider the following collection: -

Picture showing the sample document collection in mongodb

To write the result of an aggregation, we will write the following query: -

db.orders.aggregate([   
    {
        $group: {
            _id: "$customerId",
            firstOrderId: { $first: "$_id" }
        }
    },
   {
     $out: "total_costs"
   }
])

Output

Posted By -	Karan Gupta

Posted On -	Thursday, June 13, 2024

Query/Feedback

Your Email Id		**

Subject		*

Query/Feedback	Characters remaining 250	**