Aggregation Commands
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Note
For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.
Aggregation Commands
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. |
group |
Deprecated. Groups documents in a collection by the specified key and performs simple aggregation. |
mapReduce |
Performs map-reduce aggregation for large data sets. |
Aggregation Methods
Name | Description |
---|---|
db.collection.aggregate() |
Provides access to the aggregation pipeline. |
db.collection.group() |
Deprecated. Groups documents in a collection by the specified key and performs simple aggregation. |
db.collection.mapReduce() |
Performs map-reduce aggregation for large data sets. |