Step 1: Switch to the Database

Before deleting data, make sure you’re using the correct database

use myDatabase

Step 2: Check Existing Data

Before deleting any records, it's a good practice to check the current data.

db.users.find().pretty()

Step 3: Delete a Single Document

To delete the first matching document, use deleteOne().

Step 4: Delete Multiple Documents

To delete all matching documents, use deleteMany().

db.users.deleteMany({ city: "New York" })

Step 5: Delete All Documents in a Collection

If you want to remove all documents but keep the collection structure, use:

db.users.deleteMany({})

✅ Deletes all records in the users collection without removing the collection itself.

Step 6: Drop an Entire Collection

If you want to delete the entire collection (including its structure), use drop().

db.users.drop()

✅ Completely removes the users collection from the database.

Step 7: Verify the Deletion

After deletion, check if the data is removed:

db.users.find().pretty()

Conclusion

You’ve learned how to delete data in MongoDB using:
✅ deleteOne() – Deletes the first matching document.
✅ deleteMany() – Deletes all matching documents.
✅ deleteMany({}) – Deletes all documents in a collection.
✅ drop() – Removes the entire collection.

Use these methods carefully, as deletions cannot be undone! 🚀