How to select a single field for all documents in a MongoDB collection?

Question

In my MongoDB, I have a student collection with 10 records having fields name and roll. One record of this collection is:

{
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Answer 1

db.student.find({}, {"roll":1, "_id":0})

This is equivalent to -

Select roll from student

db.student.find({}, {"roll":1, "name":1, "_id":0})

This is equivalent to -

Select roll, name from student