Drop collection vs deleteMany in MongoDB - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to remove all documents from the 'users' collection without deleting the collection itself.

MongoDB

db.users.[1]({})

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

AdeleteOne

BdeleteMany

Cremove

Ddrop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'drop' deletes the entire collection, not just documents.

Using 'deleteOne' deletes only one document.

The deleteMany({}) command deletes all documents in the collection but keeps the collection itself.

2fill in blank

medium

Complete the code to completely remove the 'orders' collection from the database.

MongoDB

db.orders.[1]()

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

Aremove

BdeleteMany

CdeleteOne

Ddrop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'deleteMany' only removes documents, not the collection.

Using 'remove' is deprecated in newer MongoDB versions.

The drop() method deletes the entire collection and its indexes.

3fill in blank

hard

Fix the error in the code that tries to delete all documents but accidentally deletes the collection.

MongoDB

db.products.[1]({})

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

Aremove

Bdrop

CdeleteMany

DdeleteOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'drop()' deletes the entire collection.

Forgetting to pass an empty filter to delete all documents.

Using drop() deletes the collection. To delete all documents but keep the collection, use deleteMany({}).

4fill in blank

hard

Fill both blanks to delete all documents from 'logs' collection but keep the collection.

MongoDB

db.logs.[1]([2])

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

AdeleteMany

B{}

Cdrop

D{ deleted: true }

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'drop' deletes the collection.

Using a non-empty filter deletes only some documents.

deleteMany({}) deletes all documents because the empty filter matches all documents.

5fill in blank

hard

Fill all three blanks to drop the 'sessions' collection and then check if it exists.

MongoDB

db.sessions.[1]();
const exists = db.getCollectionNames().[2](name => name === [3]);

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

Adrop

Bsome

C'sessions'

DdeleteMany

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'deleteMany' instead of 'drop' deletes documents but not the collection.

Using 'includes' instead of 'some' for checking existence in this context.

drop() removes the collection. Then some() checks if 'sessions' is still in the list of collections.