Aggregation Commands

On this page

Aggregation Commands

Aggregation Methods

MongoDB 5.0 is end of life as of October 2024. This version of the documentation is no longer supported. To upgrade your 5.0 deployment, see the MongoDB 6.0 upgrade procedures.

Note

For details on a specific operator, including syntax and examples, click on the link to the operator's reference page.

Aggregation Commands

Name	Description
`aggregate`	Performs aggregation tasks such as `$group` using an aggregation pipeline.
`count`	Counts the number of documents in a collection or a view.
`distinct`	Displays the distinct values found for a specified key in a collection or a view.
`mapReduce`	Performs map-reduce aggregation for large data sets.

Aggregation Methods

Name	Description
`db.collection.aggregate()`	Provides access to the aggregation pipeline.
`db.collection.mapReduce()`	Performs map-reduce aggregation for large data sets.

Back

Quick Reference

Commands Comparison