How aggregation works on mongodb

Question

Accepted Answer

Aggregation in MongoDB is a framework for performing data processing operations on documents within a collection.

Aggregation pipeline stages allow for data transformation, filtering, sorting, grouping, and more
Operators like $match, $group, $project, $sort, $limit, $skip are commonly used in aggregation
Aggregation results can be output to a new collection, returned inline, or used for further processing

Accepted Answer

MongoDB aggregation is a powerful framework for processing and transforming data within collections. It works through the aggregation pipeline, where data passes through multiple stages, and each stage performs a specific operation. The output from one stage becomes the input for the next stage, allowing you to create complex data transformations.

Each stage performs an operation on the input documents, and the output is passed to the next stage. The most common stages include:

$match: Filters documents that match specific conditions (similar to a WHERE clause in SQL).

How aggregation works on mongodb

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