MongoDB Aggregation - How to Perform Complex Data Analysis with MongoDB

what is Aggression in MongoDB?

Aggregation operation process the data records and provide the outcomes after computation. Able to perform a variety of operations, Aggregation operations combine the values from various sources and group the outcome into a single result.

Aggregate () method in MongoDB

This method is used to perform aggregation operations using following command –

>db.COLLECTION_NAME.aggregate(AGGREGATE_OPERATION)

MongoDB Aggregation Pipeline

Pipeline concept works in using the output of one process as the input of the next process. This concept can be applied in the MongoDB framework using the following commands-

• $project − For selecting specific fields from the collection.
• $match − For reducing the amount of documents to be given as input in the next stage.
• $group − Performs aggregation.
• $sort − For sorting the documents.
• $skip − For skipping forward in the list of documents.
• $limit − To restrict the amount of documents to be viewed starting from the current position.
• $unwind − To unwind the documents that use the arrays.