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Exercise 4: Changing the sort order in the aggregation pipeline

MongoDB 301: Aggregation Introducing the Aggregation Editor Exercise 4: Changing the sort order in the aggregation pipeline

In this exercise, you’ll update the $sort stage, which is the fifth and last stage in the pipeline. You’ll base the sort order on the state field, rather than the total field, and specify that the documents be sorted in ascending order.

To change the sort order in the aggregation pipeline

  1. Go to the 5: $sort tab in the Aggregation Editor.
  2. Replace the existing expression with the following code:
{ "state": 1 }

The new code specifies that the documents should be ordered based on the state field. The value 1 indicates that they should be sorted in ascending order.

  1. In the Stage Input pane, click the Execute button. Studio 3T runs the pipeline up to but not including the current stage. This is the data that is used as input for the $sort stage.
  2. In the Stage Output pane, click the Execute button. This will execute the pipeline up to and including the fifth stage. The following figure shows part of the results, with the documents sorted by the state field.
  1. Go to the Query Code tab. Verify that the $sort operator and its expression have been updated. The aggregate statement should now look like the following code:
db.getCollection("customers").aggregate(
  [
    { 
      "$match" : { 
        "dob" : { 
          "$lt" : ISODate("1970-01-01T00:00:00.000+0000")
        }
      }
    }, 
    { 
      "$group" : { 
        "_id" : "$address.state", 
        "total" : { 
          "$sum" : "$transactions"
        }
      }
    }, 
    {
     "$project" : { 
        "_id" : 0.0, 
        "state" : "$_id", 
        "total" : 1.0
      }
    }, 
    { 
      "$replaceRoot" : { 
        "newRoot" : { 
          "state" : "$state", 
          "total" : "$total"
        }
      }
    }, 
    { 
      "$sort" : { 
        "state" : 1.0
      }
    }
  ], 
  { 
    "allowDiskUse" : true, 
    "collation" : { 
      "locale" : "en_US"
    }
  }
);
  1. Go to the Pipeline tab. Verify that the pipeline includes all five stages and that they’ve been added and updated as expected.
  2. In the Pipeline output pane, click the Refresh button to update the results. Studio 3T runs the statement and returns the results, as shown in the following figure.

The results should include the state and total fields, with the data sorted in ascending order based on the state field. As you saw earlier, the results also include the _id field when viewing them in Table View, but if you switch to JSON View, you’ll see only the state and total fields.

  1. Click Save on the Aggregation Editor toolbar to save your changes. You will use the state_transaction.js file for the next section in this course.
  2. Close the Aggregation tab and then close Studio 3T.

Quizzes
Introducing the Aggregation Editor: Test your skills
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  • Course Home Expand All
    Building a Basic Aggregation
    4 Topics | 1 Quiz
    Exercise 1: Filtering the documents in the aggregation pipeline
    Exercise 2: Grouping the documents in the aggregation pipeline
    Exercise 3: Sorting the documents in the aggregation pipeline
    Exercise 4: Adding processing options to the aggregation
    Building a Basic Aggregation: Test your skills
    Introducing the Aggregation Editor
    4 Topics | 1 Quiz
    Exercise 1: Importing an aggregate statement into the Aggregation Editor
    Exercise 2: Replace a field in the aggregation pipeline
    Exercise 3: Reorder the fields in the aggregation pipeline
    Exercise 4: Changing the sort order in the aggregation pipeline
    Introducing the Aggregation Editor: Test your skills
    Working with Arrays in the Aggregation Pipeline
    5 Topics | 1 Quiz
    Exercise 1: Using expression operators to filter input documents
    Exercise 2: Unwinding an array to create individual documents
    Exercise 3: Grouping array values and generating a document count for each group
    Exercise 4: Writing pipeline results to a new collection
    Working with Arrays in the Aggregation Pipeline: Test your skills
    MongoDB 301 Mid-Course Feedback
    Adding Lookup Data to the Aggregation Pipeline
    4 Topics | 1 Quiz
    Exercise 1: Adding lookup data to the aggregation pipeline
    Exercise 2: Converting string values in one of the lookup fields to integers
    Exercise 3: Adding a computed ratio field based on the converted lookup field
    Exercise 4: Limiting the number of returned documents
    Adding Lookup Data to the Aggregation Pipeline: Test your skills
    Working with Reschema for MongoDB
    4 Topics | 1 Quiz
    Exercise 1: Setting up a reschema unit that includes lookup data
    Exercise 2: Defining a target collection in the reschema unit
    Exercise 3: Adding and scheduling a task to create the target collection
    Exercise 4: Running an aggregate statement against the target collection
    Working with Reschema for MongoDB: Test your skills
    Reporting with Studio 3T Aggregations
    3 Topics | 1 Quiz
    Exercise 1: Creating a view based on an aggregation query
    Exercise 2: Exporting a collection as a .csv file for use by a third-party tool
    Exercise 3: Visualizing collection data in MongoDB Charts
    Reporting with Studio 3T Aggregations: Test your skills
    Course Extras
    Return to MongoDB 301: Aggregation
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