Full Stack Day-7

Select the correct query to display users with age in the descending order.

• db.users.find().sort({age:1})

• db.users.find().limit()

• . db.users.find()

• . db.users.find().sort(age:-1)

You want to return maximum 5 matching documents that will return with only the _id, name, and address fields. Which of the following queries will you use?

• . db.users.find( { age: { $gt: 18 } }, { name: 1, address: 1 } ).limit(5)

• db.users.find( { age: { $gt: 18 } }, { name: 1, address: 1 } ).limit(15)

• db.users.find( { age: { $lt: 18 } }, { name: 1, address: 1 } ).limit(5)

• . db.users.find( { age: { $lt: 18 } }, { name: 1, address: 1 } ).limit(15)

1. NoSQL databases is used mainly for handling large volumes of ______________ data.

• . unstructured

• . structured

• semi-structured

• all of the mentioned

A collection and document in MongoDB is equivalent to ___________ concepts respectively.

• Row and Column

• Table and Row

• Column and Row

• Database and Table

Which command is used to remove all documents from ‘employees’ collection?

• db.employees.find({})

• db.employees.remove({})

• db.employees.delete({})

• db.employees.drop()