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Sams Teach Yourself NoSQL with MongoDB in 24 Hours by Brad Dayley

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Hour 9. Utilizing the Power of Grouping, Aggregation, and Map Reduce

What You’ll Learn in This Hour:

Image Grouping documents based on a field value

Image Creating an aggregation pipeline

Image Using aggregation pipelines to manipulate the results

Image Building map reduce operations with reduce and finalize functions

Using map reduce to reduce a set of documents into ...

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