翻译或纠错本页面
- Reference >
- Database Commands >
- Aggregation Commands
Aggregation Commands¶
Name | Description |
---|---|
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. |
For a detailed comparison of the different approaches, see Aggregation Commands Comparison.