Question

How do you get the values of _id field for all the documents in students collection?

A) db.students.find()._id
B) db.students.findOne()._id
C) db.student.find().forEach(function(doc){printjson(doc._id)})
D) db.student.find().forEach(function(doc){printjson(doc._id.getTimestamp()})

Answer 1

The correct MongoDB query to retrieve the _id field of all documents in the students collection is "db.students.find().forEach(function(doc){printjson(doc._id)})".

Step-by-step explanation:

To get the values of the _id field for all the documents in the students collection, you would use a MongoDB query. The correct option from the list provided is C) db.students.find().forEach(function(doc){printjson(doc._id)}). This command will iterate over all documents in the students collection and print out the _id field of each document. The find() method retrieves all documents, and the forEach() function with printjson() prints each _id to the console in a readable JSON format.