Why the paradigm shift matters in MongoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all documents in the collection.

MongoDB

db.collection.[1]()

Drag options to blanks, or click blank then click option'

Afind

Binsert

Cupdate

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert() instead of find() to get data.

The find() method retrieves all documents from a MongoDB collection.

2fill in blank

medium

Complete the code to insert a new document into the collection.

MongoDB

db.collection.[1]({ name: 'Alice', age: 30 })

Drag options to blanks, or click blank then click option'

AupdateOne

BinsertOne

CdeleteOne

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using find() to add data instead of insertOne().

The insertOne() method adds a single new document to the collection.

3fill in blank

hard

Fix the error in the query to update a document's age.

MongoDB

db.collection.updateOne({ name: 'Alice' }, { [1]: { age: 31 } })

Drag options to blanks, or click blank then click option'

A$set

B$get

C$add

D$remove

Attempts:

3 left

💡 Hint

Common Mistakes

Using $get or $add which are not valid update operators.

The $set operator updates the value of a field in a document.

4fill in blank

hard

Fill both blanks to find documents where age is greater than 25.

MongoDB

db.collection.find({ age: { [1]: [2] } })

Drag options to blanks, or click blank then click option'

A$gt

B$lt

C25

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using $lt (less than) instead of $gt (greater than).

The $gt operator means 'greater than'. We want ages greater than 25.

5fill in blank

hard

Fill all three blanks to delete documents where status is 'inactive' and age is less than 20.

MongoDB

db.collection.deleteMany({ status: [1], age: { [2]: [3] } })

Drag options to blanks, or click blank then click option'

A'inactive'

B$lt

C20

D'active'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'active' instead of 'inactive' for status.

We delete documents where status is 'inactive' and age is less than 20 using $lt.