For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.
|aggregate||Performs aggregation tasks such as group using the aggregation framework.|
|count||Counts the number of documents in a collection.|
|distinct||Displays the distinct values found for a specified key in a collection.|
|group||Groups documents in a collection by the specified key and performs simple aggregation.|
|mapReduce||Performs map-reduce aggregation for large data sets.|