findOne method in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find one document in the 'users' collection.

MongoDB

db.users.[1]({})

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AupdateOne

BfindOne

CinsertOne

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using find instead of findOne returns a cursor, not a single document.

The findOne method returns a single document from the collection that matches the query.

2fill in blank

medium

Complete the code to find one user with the name 'Alice'.

MongoDB

db.users.findOne({ name: [1] })

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A'David'

B'Bob'

C'Alice'

D'Charlie'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string value.

Using the wrong name.

The query object specifies name: 'Alice' to find a user named Alice.

3fill in blank

hard

Fix the error in the code to find one document where age is 30.

MongoDB

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

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A30

B"30"

C'30'

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers, which makes them strings.

Using a variable name instead of a value.

The age value should be a number, not a string, so use 30 without quotes.

4fill in blank

hard

Fill both blanks to find one document where status is 'active' and return only the name field.

MongoDB

db.users.findOne({ status: [1] }, { [2]: 1 })

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A'active'

Bstatus

Cname

D'inactive'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong field name in the projection.

Using 'inactive' instead of 'active' in the query.

The query filters for status: 'active' and the projection returns only the name field.

5fill in blank

hard

Fill all three blanks to find one document where age is greater than 25 and return only the name and age fields.

MongoDB

db.users.findOne({ age: { [1]: [2] } }, { [3]: 1, age: 1 })

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

A$gt

B25

Cname

D$lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$lt' instead of '$gt' for greater than.

Forgetting to include the 'name' field in the projection.

The query uses $gt: 25 to find ages greater than 25, and the projection includes name and age fields.