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Aggregation Commands

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.