Aggregation Reference聚合参考
Aggregation Pipeline Quick Reference聚合管道快速参考Quick reference card for aggregation pipeline.聚合管道的快速参考卡。Aggregation Commands聚合命令The reference for the data aggregation commands, which provide the interfaces to MongoDB's aggregation capability.数据聚合命令的引用，它为MongoDB的聚合功能提供了接口。Aggregation Commands Comparison聚合命令比较A comparison ofmapReduceandaggregatecommands.mapReduce和aggregate命令的比较。Aggregation Pipeline Operators聚合管道运算符Aggregation pipeline operations have a collection of operators available to define and manipulate documents in pipeline stages.聚合管道操作有一组运算符，可用于在管道阶段定义和操作文档。Variables in Aggregation Expressions聚合表达式中的变量Use of variables in aggregation pipeline expressions.在聚合管道表达式中使用变量。SQL to Aggregation Mapping ChartSQL到聚合映射图An overview common aggregation operations in SQL and MongoDB using the aggregation pipeline and operators in MongoDB and common SQL statements.概述SQL和MongoDB中常见的聚合操作，使用MongoDB中的聚合管道和运算符以及常见的SQL语句Practical MongoDB Aggregations (e-book)实用的MongoDB聚合（电子书）
For more information on aggregations, read the Practical MongoDB Aggregations有关聚合的更多信息，请阅读实用MongoDB聚合电子书 e-book.。