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MongoDB Quiz

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Check what you have learned in the MongoDB tutorial. All questions use the students collection from the lessons.

Topics in This Quiz

Documents, collections and mongosh
Inserting and finding documents
Updating and deleting
Sorting, indexes and aggregation

Question 1

Exercise

In MongoDB, what is a collection most similar to in a SQL database?

A rowA tableA columnA query

Question 2

Exercise

Which shell command switches to the institute database?

use instituteopen institute\c institutedb.switch("institute")

Question 3

Exercise

Which method adds several documents in one call?

insertOne()addAll()insertMany()push()

Question 4

Exercise

Which filter finds students from Lahore or Islamabad?

{ city: "Lahore", city: "Islamabad" }{ city: { $in: ["Lahore", "Islamabad"] } }{ city: { $all: ["Lahore", "Islamabad"] } }{ $and: [ { city: "Lahore" }, { city: "Islamabad" } ] }

Question 5

Exercise

In db.students.find({ city: "Karachi" }, { _id: 0, name: 1 }), what does the second argument do?

It sorts the results by nameIt shows only the name field and hides _idIt limits the result to one documentIt deletes the _id field from the database

Question 6

Exercise

Which update adds "React" to Ali's skills array?

{ $set: { skills: "React" } }{ $inc: { skills: "React" } }{ $push: { skills: "React" } }{ $unset: { skills: "React" } }

Question 7

Exercise

What does db.students.deleteMany({}) do?

Nothing, because the filter is emptyDeletes the first document onlyDeletes every document in the collectionDeletes the collection's indexes

Question 8

Exercise

In the output of explain(), what does COLLSCAN mean?

An index was usedMongoDB read every document in the collectionThe query failedThe collection was deleted

Question 9

Exercise

In an aggregation pipeline, which stage works like a LEFT JOIN with another collection?

$group$unwind$match$lookup

What Next?

Well done on finishing the MongoDB tutorial. Build a full app with Node.js and React, or learn relational databases with the SQL tutorial.

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Learn MongoDB with a teacher

Join the Full Stack Development course at Workownix, online or in Orangi Town, Karachi, and get a certificate.

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Learn MongoDB with a teacher

Join the Full Stack Development course at Workownix, online or in Orangi Town, Karachi, and get a certificate.

See the course Ask on WhatsApp