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Academy 3T

  • MongoDB 101: Getting Started
  • MongoDB 201: Querying MongoDB Data
  • MongoDB 301: Aggregation

Lesson 3, Exercise 5: Sorting the documents in the aggregation pipeline

MongoDB 201: Querying MongoDB Data Working with the MongoDB Aggregation Pipeline Lesson 3, Exercise 5: Sorting the documents in the aggregation pipeline

In this exercise, you will add the fifth and last stage to the pipeline. The stage is based on the $sort aggregate operator, which lets you sort the documents in the pipeline, based on one or more fields.

To sort the documents in the aggregation pipeline

1. On the Pipeline tab of the Aggregation Editor, ensure that the Stage 4 row is selected (the $replaceRoot row), click the small down arrow to the right of the Add button, and click Add New Stage After Selected Stage. 

The Aggregation Editor adds the Stage 5 tab to the right of the Stage 4 tab and makes the new tab active.

2. On the Stage 5 tab, select the $sort option from the operator drop-down list in the upper left corner.

When you select the $sort option, the Aggregation Editor adds two lines of placeholder comments.

3. In the editor window, delete the placeholders and type the following expression between the curly braces:

total: -1

The expression specifies that the documents should be sorted by the total field in descending order, as indicated by the -1 value.

If you want to sort a field in ascending order, you must specify the 1 value.

4. In the Stage Output pane in the bottom section, click the Execute button.

This will execute the pipeline up to and including the fifth stage. The following figure shows part of the results, as they appear in Table View.

Stage output

The results are now sorted by the total field, with the highest amounts listed first. As you can see, most transactions come out of Sacramento, followed by Los Angeles.

5. Go to the Query Code tab. Verify that the code includes all five pipeline operators and their expressions, as shown in the following figure.

You can copy the code to the clipboard or open it in IntelliShell, where you can edit it further.

6. Go to the Pipeline tab. Verify that the pipeline includes the Stage 5 row and that the row contains the $sort operator and its expression. The tab should now look like the one in the following figure.

7. Close the Aggregation tab. If prompted to save your changes, click No.

8. Close Studio 3T.

Next – Test your skills: Working with the MongoDB Aggregation Pipeline
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  • Course Home Expand All
    Performing MongoDB CRUD Operations
    4 Topics | 1 Quiz
    Lesson 1, Exercise 1: Adding a document to a collection
    Lesson 1, Exercise 2: Viewing a document in a collection
    Lesson 1, Exercise 3: Updating a document in a collection
    Lesson 1, Exercise 4: Deleting a document from a collection
    Test your skills: Performing CRUD Operations
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    Lesson 2: The MongoDB find method
    Lesson 2, Exercise 1: Using IntelliShell to build and run find statements
    Lesson 2, Exercise 2: Using Visual Query Builder to build and run find statements
    Lesson 2, Exercise 3: Using Query Code and IntelliShell to modify and run a find statement
    Test your skills: Building MongoDB find() Queries
    Working with the MongoDB Aggregation Pipeline
    6 Topics | 1 Quiz
    Lesson 3: Introducing the MongoDB aggregate method
    Lesson 3, Exercise 1: Filtering the documents in the aggregation pipeline
    Lesson 3, Exercise 2: Grouping the documents in the aggregation pipeline
    Lesson 3, Exercise 3: Adding and removing fields in the aggregation pipeline
    Lesson 3, Exercise 4: Changing the field order in the aggregation pipeline
    Lesson 3, Exercise 5: Sorting the documents in the aggregation pipeline
    Test your skills: Working with the MongoDB Aggregation Pipeline
    Querying Arrays Using MongoDB $elemMatch
    3 Topics | 1 Quiz
    Lesson 4, Exercise 1: Using IntelliShell to query single and multiple values in an array
    Lesson 4, Exercise 2: Using Visual Query Builder to query a single array value
    Lesson 4, Exercise 3: Using Visual Query Builder to query multiple array values
    Test your skills: Querying Arrays Using MongoDB $elemMatch
    Querying Embedded Documents in MongoDB Arrays
    3 Topics | 1 Quiz
    Lesson 5, Exercise 1: Using the $elemMatch operator to query embedded documents
    Lesson 5, Exercise 2: Using conditional operators to query embedded documents
    Lesson 5, Exercise 3: Using Visual Query Builder to query embedded documents
    Test your skills: Querying Embedded Documents in Arrays
    Querying MongoDB with SQL SELECT Statements
    2 Topics | 1 Quiz
    Lesson 6, Exercise 1: Using the SQL Query tool to run SQL statements
    Lesson 6, Exercise 2: Using the SQL Query tool to aggregate collection data
    Test your skills: Querying MongoDB with SQL
    Working with MongoDB Views
    3 Topics | 1 Quiz
    Lesson 7, Exercise 1: Creating a MongoDB view
    Lesson 7, Exercise 2: Querying a MongoDB view
    Lesson 7, Exercise 3: Modifying and deleting a MongoDB view
    Test your skills: Working with MongoDB Views
    Course Extras
    Return to MongoDB 201: Querying MongoDB Data
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