MongoDB CRUD Operations Quiz Questions (original) (raw)

How do you create a database in MongoDB?

• db.createDatabase("")

What happens when you execute db.dropDatabase()?

• Deletes the current database and all its collections
• Deletes only empty collections from the database
• Removes only the database name but keeps the data
• Raises an error if the database is not empty

Which method is used to delete an entire collection in MongoDB?

• db.collection.removeAll()
• db.collection.deleteMany({})
• db.removeCollection("<collection_name>")

Which method allows inserting multiple documents into a MongoDB collection at once?

What does the updateOne() method do?

• Updates all documents that match the filter
• Updates the first matching document only
• Replaces an entire document
• Deletes a document before updating

How do you delete all documents that match a given filter in MongoDB?

How do you find a document with a specific _id in MongoDB?

• db.collection.findById(id)
• db.collection.find({ "_id": id })
• db.collection.getDocument(id)
• db.collection.findOne(id)

What does the findOneAndDelete() method do?

• Deletes all matching documents
• Finds and returns a document, then deletes it
• Deletes the first matching document without returning it
• Deletes a document after replacing it

How can you query for documents where a field is missing?

• { field: { $exists: false } }
• { field: { $notexists: true } }
• { field: { $missing: true } }

Which MongoDB method finds a document and updates it in one step?

There are 10 questions to complete.

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