MongoDB Aggregation in PHP

Overview

In this unit, you'll learn how to perform basic aggregation with PHP by using MongoDB's aggregation framework. First, you'll learn what aggregation is and explore the components of an aggregation pipeline. Next, you'll learn how to build a pipeline that uses the $match and $group stages. Finally, you'll explore the $sort and $project stages and build a pipeline that uses them.

Lesson 1 – Building a MongoDB Aggregation Pipeline in PHP Applications

1. What is the aggregation framework used for? (Select one.)

   A. To process documents and return computed results

   B. To create database schema

   C. To create basic CRUD commands

   D. To create serverless functions

2. Which component(s) of an aggregation pipeline do documents pass through for processing in sequence? (Select one.)

   A. Aggregation stages

   B. Aggregation operators

   C. The MongoDB\Collection::aggregate() method

Lesson 2 – Using MongoDB Aggregation Stages with PHP: Match and Group

1. Which of the following aggregation pipeline stages separates documents according to a key? (Select one.)

   A. $match

   B. $group

   C. $project

   D. $sort

2. Which of the following aggregation pipeline stages selects documents that meet the specified query condition(s) and passes the documents to the next stage? (Select one.)

   A. $match

   B. $project

   C. $group

   D. $sort

Lesson 3 – Using MongoDB Aggregation Stages with PHP: Sort and Project

1. Which of the following aggregation stages organizes the input documents in ascending or descending order? (Select one.)

   A. $orderBy

   B. $project

   C. $sort

   D. $group

2. Which of the following aggregation stages passes the documents with the requested fields to the next stage in the pipeline? (Select one.)

   A. $match

   B. $project

   C. $group

   D. $sort