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Aggregation Stages

Explore MongoDB aggregation stages to filter, sort, project, and group documents within query pipelines. This lesson helps you understand how to build advanced data analysis queries using the aggregation framework for insightful results.

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MongoDB offers some keywords to add stages in our pipelines to perform required actions. Let’s see each one in detail.

The $match stage

It filters the documents and is very similar to the .find() method. Here's an example used to filter documents in the orders collection to include only shipped orders.

MongoDB
db.orders.aggregate([
  {
    $match: {
      status: "Shipped"
    }
  }
])

Explanation: In line 1, we directly specify that this query needs to be executed via the aggregation pipeline: db.orders.aggregate. Here, ...