mongo.tar.gz

MongoDB is an open-source NoSQL database and stores data in the form of documents. It can be used as an alternative to traditional relational databases. NoSQL databases are schema-less and useful for working with large sets of distributed data. 

In this course, you will learn the core concepts of MongoDB including queries, documents, embedded documents, and operators with advanced features like CRUD operations, bulk write operations, GridFS, indexing, aggregation pipeline, authorization, and more.

You will have plenty of hands-on experience with the help of interactive widgets, and by the end you will have a strong understanding of how to build MongoDB-based applications.

MongoDB: The Complete Guide

## `$addToSet` operator

The **`$addToSet`** operator is similar to the `$push` operator, except it only adds the value if it doesn’t already exist.

# `$addToSet` operator

The **`$addToSet`** operator is similar to the `$push` operator, except it only adds the value if it doesn’t already exist.

# `＄addToSet` operator

The **`＄addToSet`** operator is similar to the `＄push` operator, except it only adds the value if it doesn’t already exist.

Learn and practice the addToSet, [], and each when updating documents.

Introduction to Database and MongoDB

Create Database and Authorization

Performing CRUD Operations on MongoDB - Part 1

Performing CRUD Operations on MongoDB - Part 2

MongoDB Query and Database Performance

Learn Additional MongoDB Topics

Appendix

Update Documents - Part 3

`$addToSet` operator