MongoDB: Aggregation

MongoDB: Aggregation

July 31, 2021

Aggregation operations process data records and return computed results. Aggregation operations group values from multiple documents together and can perform a variety of operations on the grouped data to return a single result.

MongoDB provides three ways to perform aggregation:

  1. Aggregation pipeline
  2. Map-reduce function
  3. Single-purpose aggregation methods
   { $match: { status: "A" } },
   { $group: { _id: "$cust_id", total: { $sum: "$amount" } } }



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