Aggregation Commands¶

On this page

Note

For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.

Name	Description
`aggregate`	Performs aggregation tasks such as group using the aggregation framework.
`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.