![mongodb compass join two collections mongodb compass join two collections](https://i.stack.imgur.com/pz75R.png)
The data that was joined by the query will be the first element in the grades array. To join two collections, we use the $lookup operator, whose syntax is defined below:
![mongodb compass join two collections mongodb compass join two collections](https://db4beginners.com/wp-content/uploads/2019/07/1-768x505.png)
In MongoDB’s JOIN operation, the goal is to connect one set of data to another set of data. If documents are part of a “joined” collection, the $lookup (Aggregation) function will return documents in the form of a subarray of the original collection. $lookup(Aggregation) creates an outer left join with another collection and helps to filter data from merged data. We can join documents on collections in MongoDB by using the $lookup (Aggregation) function. To resolve this problem, we introduce the JOIN concept, which facilitates the relationship between the data. MongoDB has some issues with linking data from one collection to another unless you use simple Script Query functions. MongoDB is a straightforward and simple-to-configure database that provides high performance, automatic scalability, and high availability.
MONGODB COMPASS JOIN TWO COLLECTIONS LICENSE
Furthermore, it is distributed under the Server Side Public License (SSPL), which supports a novel mechanism for storing and retrieving large amounts of data. This enables it to store various types of data. MongoDB, which was founded in 2009, employs the Document-Oriented Database Model to organize data into documents and collections rather than tables. MongoDB is a non-relational Database Management System that is Open Source and Cross-Platform.
MONGODB COMPASS JOIN TWO COLLECTIONS HOW TO
How To Join Two Collections In MongoDB?.Upon a complete walkthrough of this article, you will learn in detail how MongoDB join two collections. Even though MongoDB isn’t an RDBMS (Relational Database Management System) and doesn’t offer extensive join methods, you can use several other operators to join two collections in MongoDB.
![mongodb compass join two collections mongodb compass join two collections](https://db4beginners.com/wp-content/uploads/2019/08/5-300x110.png)
There are several NoSQL databases out there, but MongoDB is the most commonly used, and it is available both as a Cloud Service and for Deployment on Self-Managed Systems.