MongoDB Tutorial for Beginners (2022) - OR Operator

This video tutorial explains how to use the OR operator in MongoDB to search for documents that meet at least one of multiple criteria. It covers setting up a MongoDB server, exploring collections, and writing queries using the OR operator. Examples demonstrate fetching documents based on age or department and handling cases where some conditions are not met.

What is the primary function of the OR operator in MongoDB?

• To ensure all conditions in a query are met

• To update documents based on multiple conditions

• To delete documents that do not meet any conditions

• To search for documents that match at least one condition

Which command is used to switch to the demo database in MongoDB?

• connect demo

• select demo

• switch demo

• use demo

What does the find method do in the context of MongoDB collections?

• It updates documents in a collection

• It creates a new collection

• It deletes documents from a collection

• It retrieves documents from a collection

In the example provided, which documents are fetched when using the OR operator with age 25 or department marketing?

• No documents are fetched

• Documents with either age 25 or department marketing

• Only documents with department marketing

• Only documents with age 25

What happens when one of the conditions in an OR query is not satisfied?

• An error is returned

• Documents satisfying at least one condition are fetched

• Only documents satisfying all conditions are fetched

• No documents are fetched