Introduction to the aggregation framework
The aggregation framework in MongoDB is a data processing tool that helps you perform complex data transformations and computations. You can use the framework to filter, transform, and get insights from data instead of writing scripts outside the database to process it.
The framework was designed around the concept of a data processing pipeline in which the data enters, and the transformation occurs as it passes from one stage to the next.
The flexibility and expressive syntax of the aggregation framework helps you shape data in various ways, from simple filtering and grouping to reshaping entire documents. Here's an example to better understand the true value of aggregation.
Imagine that you're managing the academic records of a university using MongoDB. Among various collections, such as courses, students, and faculty, you have a student_grades collection. Each document in this collection represents a course grade for a...
