From the course: MongoDB Java Developer Associate Cert Prep
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MongoDB aggregation with Java review
From the course: MongoDB Java Developer Associate Cert Prep
MongoDB aggregation with Java review
- In this unit, you learned about the aggregation pipeline and how to build one using the aggregates builder class, as well as the filters, sorts, and projections builder classes to match, sort, and project. Aggregation is a powerful tool for filtering, sorting, and projecting data without changing anything in your collection. Aggregation allows us to string together aggregation operations, which are known as stages, to create an aggregation pipeline. This way, we can dictate exactly how we want to process our data step by step. We started by giving an overview of aggregation and the stages of an aggregation pipeline. These stages include finding, sorting, grouping, and projecting, and can use expression operators. Then we moved on to the match and group stages of a pipeline. We learned how to create them by using the aggregates builder class. Next, we explored the sort and project stages of a pipeline and how to create them by using the aggregates builder class. Finally, we used the…
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