What is MongoDB - Interactive Quiz & Practice

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'

Ainsert

Bfind

Cupdate

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'insert' instead of 'find' to get data.

Using 'update' or 'delete' which change or remove 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: 25 })

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

AinsertOne

Bfind

CdeleteOne

DupdateOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'find' which only reads data.

Using 'deleteOne' or 'updateOne' which remove or change data.

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

3fill in blank

hard

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

MongoDB

db.collection.updateOne({ name: 'Alice' }, { [1]: { age: 26 } })

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' which is not a valid update operator.

Using '$add' or '$remove' which do not update fields.

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

4fill in blank

hard

Fill both blanks to delete a document where age is 30.

MongoDB

db.collection.[1]([2]: 30)

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

AdeleteOne

Bage

Cname

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' which is deprecated.

Using 'name' instead of 'age' in the filter.

The deleteOne() method removes one document matching the filter. The filter uses the field age with value 30.

5fill in blank

hard

Fill all three blanks to find documents where age is greater than 20.

MongoDB

db.collection.find({ [1]: { [2]: [3] } })

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

Aage

B$gt

C20

D$lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$lt' which means less than.

Using wrong field names or values.

This query finds documents where the age field is greater than ($gt) 20.