Unlike relational databases, there are no native methods for relations in MongoDB. However, we can try to create relations by referencing the _id between documents.

We will continue to use the sample database, sample_supplies, for this demo. In the …

Schema validation

While MongoDB does not enforce data type validation by default, it can be enabled by specifying validation rules when creating a collection.

// Use database: sample_supplies
> use sample_supplies
switched to db …

bulkWrite() method

db.collection.bulkWrite() method can perform these operations:

• insertOne
• updateOne
• updateMany
• replaceOne
• deleteOne
• deleteMany

It has the following syntax:

db.collection(
    [
        {
            <operation1>: { …

Aggregation pipeline stages

Aggregation pipeline is an array of aggregation methods that process data stage-by-stage until a result is returned at the end of the pipeline.

Aggregation pipeline stages for a collection is executed by the …

Managing inventory for an office supply store

Imagine running an office supply company. We need to keep track of customer information, sales data, and store location.

Sales data query

We may ask these questions related to sales …

How records are stored

• Each record is called a Document, which is BSON formatted.
• Documents are grouped into a Collection.
• Collections are grouped into a Database.

List all DB

> show dbs
admin   0.000GB
config  0.000GB
local …

Sample data source

A variety of sample data is provided by the developers of MongoDB. They can be found here:
https://developer.mongodb.com/article/atlas-sample-datasets/

A link to directly download all available sample datasets (307 MB): …

Using mongo Shell

Mongo shell is an interactive JavaScript interface to perform query and administrative tasks. It can be launched in a command-line interface or operated by other applications.

Launching a mongo shell in command …

Installing MongoDB Community Server on Ubuntu 20.04 LTS

Ubuntu on Windows Subsystem for Linux cannot use this method because systemd is not enabled.

1. Import MongoDB GnuPG public key
   wget -qO - …

What makes MongoDB different?

MongoDB being a document-oriented database, each record is contained in a BSON-formatted document. Without the typical restrictions of a table layout, fields and properties can be inserted and removed anytime, …