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Mongodb delete documents


In MongoDB, we can manually delete a document from a collection in the selected database using db.collection_name.remove() method.

  • Type the command use DATABASE_NAME in the command prompt to create a new database or to select the already created database with the respective name.

For Example: use Hellodb

  • Type the command createCollection(name, options) in the command prompt to create a new collection manually.

For Example: db.createCollection(“HELLO”)

  • Type the command Collection_Name.insert(Document_name) to insert a document into the already created collection.

For Example: db.HELLO.insert ({“name”: “welcome”})

  • For automatic creation of the collection directly insert a document into a collection with the desired name using the Collection_Name.insert(Document_name) command.

For Example: db.HELLO.insert ({“name”: “welcome”})

  • Type the command collection_name.find() in the command prompt to see the inserted document in a collection.

For Example: db.HELLO.find()

  • Type the command collection_name.remove({}) in the command prompt to remove all the documents from a collection.

For Example: db.HELLO.remove({})

  • Type the command collection_name.remove({type : “type_name”}) in the command prompt to remove all the documents from a collection that match the type.

For Example: db.HELLO.remove({type : “SQL”})

  • Type the command collection_name.remove({type : “type_name”}, 1) in the command prompt to remove a single document from a collection that match the type.

For Example: db.HELLO.remove({type : “SQL”}, 1)

  • Type the command collection_name.find() in the command prompt to check the remaining documents in the collection.

For Example: db.HELLO.find()

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