Why result control matters in MongoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all documents in the 'users' collection.

MongoDB

db.users.[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.

Trying to update or delete when just reading data.

The find() method retrieves documents from a collection. Other methods like insert(), update(), and delete() modify data instead.

2fill in blank

medium

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

MongoDB

db.users.find().[1](5)

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

Askip

Bcount

Climit

Dsort

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'skip' to limit results instead of 'limit'.

Using 'count' which returns a number, not documents.

The limit() method restricts the number of documents returned. skip() skips documents, sort() orders them, and count() returns the number of documents.

3fill in blank

hard

Fix the error in the code to sort users by age in ascending order.

MongoDB

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

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

Alimit

Bsort

Cskip

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'limit' or 'skip' to order results.

Using 'count' which returns a number, not sorted documents.

The sort() method orders documents. Using sort({ age: 1 }) sorts by age ascending. Other methods do not order results.

4fill in blank

hard

Fill both blanks to skip the first 3 documents and limit the results to 4.

MongoDB

db.users.find().[1](3).[2](4)

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

Askip

Blimit

Csort

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of skip and limit.

Using 'sort' or 'count' instead of skip or limit.

skip(3) skips the first 3 documents, and limit(4) limits the output to 4 documents. This combination controls which results you see.

5fill in blank

hard

Fill all three blanks to find users older than 25, sort by name ascending, and limit to 3 results.

MongoDB

db.users.find({ age: { [1]: 25 } }).[2]({ name: 1 }).[3](3)

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

A$gt

Bsort

Climit

D$lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$lt' instead of '$gt' for filtering.

Mixing up the order of sort and limit.

Forgetting to use a filter operator.

$gt means 'greater than' to filter ages above 25. sort({ name: 1 }) orders by name ascending. limit(3) restricts results to 3 documents.