Aggregation Resources

Aggregation Database Commands and Methods

The reference for the data aggregation commands, which provide the interfaces to MongoDB's aggregation capability.

Aggregation Stages

Reference for aggregation pipeline stages. Aggregation pipelines are made up of an array of stages. Documents pass through each stage in sequence.

Variables in Aggregation Expressions

Use of variables in aggregation pipeline expressions.

MongoDB Query Language Reference

Reference for MQL. Use MQL operators and expressions in aggregations and other MQL queries.

SQL to Aggregation Mapping Chart

An overview common aggregation operations in SQL and MongoDB using the aggregation pipeline and operators in MongoDB and common SQL statements.

Aggregation Commands Comparison

A comparison of mapReduce and aggregate commands.

Practical MongoDB Aggregations (e-book)

For more information on aggregations, read the Practical MongoDB Aggregations e-book.