$unset operator for removing fields in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to remove the field 'age' from all documents.

MongoDB

db.collection.updateMany({}, [1])

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

A{ $set: { age: null } }

B{ $remove: { age: 1 } }

C{ $unset: { age: "" } }

D{ $delete: { age: true } }

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set to null instead of $unset to remove the field.

Using non-existent operators like $remove or $delete.

The $unset operator removes the specified field from documents. Using { $unset: { age: "" } } removes the 'age' field.

2fill in blank

medium

Complete the code to remove the 'address' field from documents where 'status' is 'inactive'.

MongoDB

db.collection.updateMany({ status: "inactive" }, [1])

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

A{ $remove: { address: 1 } }

B{ $unset: { status: "" } }

C{ $set: { address: null } }

D{ $unset: { address: "" } }

Attempts:

3 left

💡 Hint

Common Mistakes

Removing the wrong field.

Using $set instead of $unset.

To remove the 'address' field only from documents with status: 'inactive', use $unset with the field name.

3fill in blank

hard

Fix the error in the code to correctly remove the 'phone' field from all documents.

MongoDB

db.collection.updateMany({}, { $unset: { phone: [1] } })

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

A""

Bnull

Ctrue

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using null or true instead of empty string.

Using numeric values like 1 which do not work with $unset.

The $unset operator requires the field to be set to an empty string "" to remove it.

4fill in blank

hard

Fill both blanks to remove 'email' and 'username' fields from documents where 'active' is false.

MongoDB

db.collection.updateMany({ active: false }, { $unset: { [1]: "", [2]: "" } })

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

Aemail

Busername

Cactive

Dpassword

Attempts:

3 left

💡 Hint

Common Mistakes

Removing wrong fields like 'active' or 'password'.

Not using empty strings as values.

To remove multiple fields, list each field with an empty string value inside $unset.

5fill in blank

hard

Fill all three blanks to remove 'city', 'state', and 'zip' fields from documents where 'country' is 'USA'.

MongoDB

db.collection.updateMany({ country: "USA" }, { $unset: { [1]: "", [2]: "", [3]: "" } })

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

Acity

Bstate

Czip

Dcountry

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'country' in the fields to remove.

Using non-empty values for $unset fields.

To remove multiple fields, list each field with an empty string value inside $unset. Here, 'city', 'state', and 'zip' are removed.