Delete all documents in collection in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to delete all documents from the collection named 'users'.

MongoDB

db.users.[1]()

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

Aremove

BdeleteOne

Cfind

DinsertMany

Attempts:

3 left

💡 Hint

Common Mistakes

Using deleteOne() deletes only one document.

Using find() does not delete documents.

Using insertMany() adds documents instead of deleting.

The remove() method deletes all documents when called without a filter.

2fill in blank

medium

Complete the code to delete all documents in the 'orders' collection using the modern method.

MongoDB

db.orders.[1]({})

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

Aremove

BdeleteMany

CupdateMany

DfindOneAndDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove() is deprecated in newer MongoDB versions.

Using findOneAndDelete() deletes only one document.

Using updateMany() modifies documents but does not delete.

The deleteMany({}) method deletes all documents matching the empty filter, which means all documents.

3fill in blank

hard

Fix the error in the code to delete all documents from the 'products' collection.

MongoDB

db.products.deleteMany([1])

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

Anull

Bundefined

C{}

D[]

Attempts:

3 left

💡 Hint

Common Mistakes

Passing null or undefined causes errors.

Passing an empty array [] is invalid as a filter.

The deleteMany() method requires a filter object. An empty object {} matches all documents.

4fill in blank

hard

Fill both blanks to delete all documents from the 'customers' collection and print the result.

MongoDB

const result = db.customers.[1]([2]);
printjson(result);

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

AdeleteMany

B{}

Cnull

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using null as filter causes errors.

Using remove is deprecated but still works.

deleteMany({}) deletes all documents. The result object shows how many were deleted.

5fill in blank

hard

Fill all three blanks to delete all documents from 'logs', check if any were deleted, and print a message.

MongoDB

const result = db.logs.[1]([2]);
if (result.[3] > 0) {
  print('Deleted documents');
} else {
  print('No documents deleted');
}

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

AdeleteMany

B{}

CdeletedCount

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of deleteMany.

Checking a wrong property instead of deletedCount.

deleteMany({}) deletes all documents. The deletedCount property shows how many were deleted.