Recall & Review
beginner
What does the
deleteOne method do in MongoDB?It deletes the first document that matches the given filter from a collection.
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beginner
How do you specify which document to delete using
deleteOne?You provide a filter object that matches the document you want to delete.
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intermediate
What does
deleteOne return after execution?It returns a result object containing information like
deletedCount, which shows how many documents were deleted (0 or 1).Click to reveal answer
beginner
Can
deleteOne delete multiple documents at once?No,
deleteOne deletes only the first matching document. To delete many, use deleteMany.Click to reveal answer
beginner
Write a simple example of using
deleteOne to remove a user with name 'Alice'.db.collection('users').deleteOne({ name: 'Alice' })
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What does
deleteOne delete in MongoDB?✗ Incorrect
deleteOne deletes only the first document that matches the filter.
Which method deletes multiple documents at once?
✗ Incorrect
deleteMany deletes all documents matching the filter.
What does the result of
deleteOne include?✗ Incorrect
The result includes deletedCount showing how many documents were deleted.
How do you specify which document to delete?
✗ Incorrect
You specify a filter object to match the document to delete.
What happens if no document matches the filter in
deleteOne?✗ Incorrect
If no document matches, nothing is deleted and deletedCount is 0.
Explain how the
deleteOne method works in MongoDB and when you would use it.Think about deleting one item from a list based on a condition.
You got /4 concepts.
Describe the difference between
deleteOne and deleteMany.Compare deleting one item versus deleting many items.
You got /4 concepts.