Common Aggregation Stages
- $match: Filters documents based on specified criteria.
- $group: Groups documents by a specified key and performs aggregate computations.
- $project: Reshapes documents by including, excluding, or adding new fields.
- $sort: Sorts documents by specified fields.
- $limit: Limits the number of documents passed to the next stage.
- $skip: Skips a specified number of documents.
- $unwind: Deconstructs an array field into multiple documents.
- $lookup: Performs a left outer join with another collection.
Explain the Concept of Aggregation Pipelines in MongoDB
The aggregation framework in MongoDB is a powerful feature that enables advanced data processing and analysis directly within the database. At the core of this framework is the aggregation pipeline, which allows you to transform and combine documents in a collection through a series of stages.
Table of Content
- Aggregation Pipelines
- Key Features of Aggregation Pipelines
- Common Aggregation Stages
- Example Aggregation Pipeline
- Complete Pipeline
- Conclusion
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