Aggregation Reference¶

Aggregation Pipeline Quick Reference: Quick reference card for aggregation pipeline.
Aggregation Commands: The reference for the data aggregation commands, which provide the interfaces to MongoDB’s aggregation capability.
Aggregation Commands Comparison: A comparison of group, mapReduce and aggregate that explores the strengths and limitations of each aggregation modality.
Aggregation Pipeline Operators: Aggregation pipeline operations have a collection of operators available to define and manipulate documents in pipeline stages.
Variables in Aggregation Expressions: Use of variables in aggregation pipeline expressions.
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.

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