NoSQL Databases - Class 3

The MongoDB Aggregation Framework is:

• a way to prevent data loss

• the same as a find query

• a way to transform documents through stages

• None of those answers

If I want to choose and rename specific fields of documents, in an aggregation stage, I would use the operator:

• $project

• $unwind

• $match

• $group

If I want to filter documents on specific conditions, in an aggregation stage, I would use the operator:

• $project

• $unwind

• $match

• $group

What stage operator was used to transform the documents on the left to the documents on the right ?

• $group

• $match

• $project

• $unwind

I can't have the same stage operator twice in an aggregation pipeline.

• True

• False