$limit and $skip stages in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to limit the results to 5 documents.

MongoDB

db.collection.aggregate([{ $limit: [1] }])

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A5

B1

C0

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 will return no documents.

Using a number larger than the collection size returns all documents.

The $limit stage restricts the number of documents passed to the next stage. Using 5 returns only the first 5 documents.

2fill in blank

medium

Complete the code to skip the first 3 documents in the aggregation.

MongoDB

db.collection.aggregate([{ $skip: [1] }])

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

A0

B1

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 means no documents are skipped.

Using a number larger than the collection size returns no documents.

The $skip stage skips the first N documents. Using 3 skips the first three documents and returns the rest.

3fill in blank

hard

Fix the error in the aggregation pipeline to correctly skip 2 documents.

MongoDB

db.collection.aggregate([{ $skip: [1] }])

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

A'2'

B2

C-2

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers causes type errors.

Negative skip values are invalid.

The $skip stage requires a non-negative integer. Using the number 2 correctly skips two documents. Using a string or negative number causes errors.

4fill in blank

hard

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

MongoDB

db.collection.aggregate([{ $skip: [1] }, { $limit: [2] }])

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A4

B3

C5

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the numbers will change the output.

Using numbers too large may return no documents.

First, $skip: 4 skips the first four documents. Then, $limit: 3 limits the output to the next three documents.

5fill in blank

hard

Fill all three blanks to skip 2 documents, limit to 4 documents, and then skip 1 more document.

MongoDB

db.collection.aggregate([{ $skip: [1] }, { $limit: [2] }, { $skip: [3] }])

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

A2

B4

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing the order of stages changes the result.

Using wrong numbers can return unexpected documents.

The pipeline first skips 2 documents, then limits the output to 4 documents, and finally skips 1 document from those 4, resulting in documents 4 to 6 from the original collection.