How MongoDB scans documents - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all documents in the collection.

MongoDB

db.collection.[1]({})

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Adelete

Binsert

Cupdate

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert instead of find

Using update instead of find

The find method retrieves documents from a MongoDB collection.

2fill in blank

medium

Complete the code to limit the number of documents returned to 5.

MongoDB

db.collection.find({}).[1](5)

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Alimit

Bskip

Ccount

Dsort

Attempts:

3 left

💡 Hint

Common Mistakes

Using skip instead of limit

Using count instead of limit

The limit method restricts the number of documents returned by a query.

3fill in blank

hard

Fix the error in the code to find documents where age is greater than 30.

MongoDB

db.collection.find({ age: { [1]: 30 } })

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A$gt

B$eq

C$lt

D$ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using $lt instead of $gt

Using $eq instead of $gt

The $gt operator means 'greater than' in MongoDB queries.

4fill in blank

hard

Fill both blanks to find documents where status is 'active' and sort by age ascending.

MongoDB

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

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A'active'

Blimit

Csort

D'inactive'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'inactive' instead of 'active'

Using limit instead of sort

Use 'active' as the value for status and sort to order results by age ascending.

5fill in blank

hard

Fill all three blanks to find documents where score is greater than 80, limit to 3, and sort by score descending.

MongoDB

db.collection.find({ score: { [1]: 80 } }).[2](3).[3]({ score: -1 })

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

A$gt

Blimit

Csort

D$lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using $lt instead of $gt

Using sort before limit

Using 1 instead of -1 for descending

Use $gt to filter scores greater than 80, limit to restrict results to 3, and sort with -1 for descending order.