MongoDB Aggregation Pipeline
The aggregation pipeline processes documents through a sequence of stages.
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LearnStep 1 of 2
Aggregation Basics
Learning Objectives
- •Understand pipeline concept
- •Use basic stages
- •Chain operations
Lesson Outline
LearnStep 1/2
Aggregation Basics
Basic Pipeline Structure
python
Common Pipeline Stages
| Stage | Purpose |
|---|---|
| $match | Filter documents (like find) |
| $project | Reshape documents, select fields |
| $group | Group by field, perform aggregations |
| $sort | Order documents |
| $limit | Limit number of documents |
| $skip | Skip documents |
| $unwind | Deconstruct array field |
| $lookup | Join with another collection |
| $addFields | Add new fields |
| $count | Count documents |
$match Stage
python
$project Stage
python
limit
python
Running Aggregation
python