Chapter 6. Aggregation
This chapter covers
- Aggregation on the e-commerce data model
- Aggregation framework details
- Performance and limitations
- Other aggregation capabilities
In the previous chapter, you saw how to use MongoDB’s JSON-like query language to perform common query operations, such as lookup by ID, lookup by name, and sorting. In this chapter, we’ll extend that topic to include more complex queries using the MongoDB aggregation framework. The aggregation framework is MongoDB’s advanced query language, and it allows you to transform and combine data from multiple documents to generate new information not available in any single document. For example, you might use the aggregation framework to determine sales by month, sales by ...
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