MongoDB TutorialLesson 12Free preview

MongoDB Aggregations

This lesson is part of MongoDB · All levels

Summary

This lesson introduces aggregation pipeline, the way MongoDB processes sequential data through multiple stages in a single command. Each stage is defined by operators such as $match to filter, $group to group and count, $sort to sort, and $project to select fields. This pipeline is equivalent to the GROUP BY function in SQL for reporting and analytics.

Key points

Aggregation runs as a pipeline containing a series of stages
$match filters documents like filter find
$group groups the data and uses accumulator like $sum and $avg
$sort, $limit, and $project set the final results of the report

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