How to add external collection to existing database in mongodb?

@daisha 

To add an external collection to an existing database in MongoDB, you can follow these steps:

1. Connect to your MongoDB database using a MongoDB client or the MongoDB shell.
2. Use the use command to switch to the existing database where you want to add the external collection. For example, if you want to add the collection to a database named mydatabase, you can use the following command:

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use mydatabase

1. Use the db.createCollection() method to create the new collection in the database. You can specify the name of the collection as well as any options you want to set for the collection. For example, to create a collection named external_collection, you can use the following command:

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db.createCollection("external_collection")

1. Once the collection is created, you can import data into the collection from your external data source. You can use the mongoimport tool to import data from a JSON or CSV file, or you can write a script to insert data programmatically using the MongoDB driver for your programming language.
2. Verify that the collection and data have been successfully added by querying the collection using the MongoDB shell or a MongoDB client.

That's it! You have now added an external collection to an existing database in MongoDB.