How to use MongoDB to Aggregate Data?
To use MongoDB for aggregating data, follow below steps:
- Connect to MongoDB: Ensure you are connected to your MongoDB instance.
- Choose the Collection: Select the collection you want to perform aggregation on, such as
students
. - Define the Aggregation Pipeline: Create an array of stages, like
$group
to group documents and perform operations (e.g., calculate the average grade). - Run the Aggregation Pipeline: Use the
aggregate
method on the collection with your defined pipeline.
Example:
db.students.aggregate([
{
$group: {
_id: null,
averageGrade: { $avg: "$grade" }
}
}
])
This calculates the average grade of all students in the students
collection.
Aggregation in MongoDB
Aggregation in MongoDB is a powerful feature that allows for complex data transformations and computations on collections of documents. It enables users to group, filter, and manipulate data to produce summarized results.
It is typically performed using the MongoDB Aggregation Pipeline which is a framework for data aggregation modeled on the concept of data processing pipelines. In this article, We will learn about Aggregation in MongoDB in detail by covering various aspects related to MongoDB Aggregation.