MongoDB Mastering MongoDB for Beginners (Theory and Projects) - $unset operator

The video tutorial introduces the unset operator, which is used to remove specific fields from documents in a database. It demonstrates how to use the unset operator with example data, showing how to remove fields like mobile numbers and names. The tutorial also covers advanced operations, such as removing nested fields within objects, and concludes with a summary of the unset operator's functionality.

What is the primary function of the unset operator?

• To add a new field to a document

• To duplicate a field in a document

• To remove a specific field from a document

• To update the value of a field

Which method is used with the unset operator to remove fields from multiple documents?

• find

• updatemany

• deleteMany

• updateOne

When using the unset operator, what must be specified to remove a field?

• The field to be removed

• The new value for the field

• The document ID

• The database name

How can you remove a nested field within an object using the unset operator?

• By using the delete operator

• By specifying the nested field path

• By duplicating the object

• By renaming the field

What happens to the field values when they are unset?

• They are archived

• They are set to null

• They are completely removed

• They are replaced with default values