MongoDB – Delete Document

In this chapter, we will learn how to delete a document using MongoDB.

The remove() Method

MongoDB's remove() method is used to remove a document from the collection. remove() method accepts two parameters. One is deletion criteria and second is justOne flag.

• deletion criteria − (Optional) deletion criteria according to documents will be removed.
• justOne − (Optional) if set to true or 1, then remove only one document.
• deletion criteria − (Optional) deletion criteria according to documents will be removed.
  justOne − (Optional) if set to true or 1, then remove only one document.

  Syntax

  Basic syntax of remove() method is as follows −

  >db.COLLECTION_NAME.remove(DELLETION_CRITTERIA)

  Example

  Consider the stuDetails collection has the following data.

  > db.stuDetails.find()
  { "_id" : 0, "name" : "aimee Zank", "class" : 10 }
  { "_id" : 1, "name" : "Aurelia Menendez", "class" : 10 }
  { "_id" : 2, "name" : "Salena Olmos", "class" : 10 }

  Following example will remove all the documents whose name is 'Salena Olmos'.

  > db.stuDetails.remove({"name":"Salena Olmos"})
  WriteResult({ "nRemoved" : 1 })
  > db.stuDetails.find()
  { "_id" : 0, "name" : "aimee Zank", "class" : 10 }
  { "_id" : 1, "name" : "Aurelia Menendez", "class" : 10 }
  >

  Remove Only One

  If there are multiple records and you want to delete only the first record, then set justOne parameter in remove() method.

  >db.COLLECTION_NAME.remove(DELETION_CRITERIA,1)

  Remove All Documents

  If you don't specify deletion criteria, then MongoDB will delete whole documents from the collection. This is equivalent of SQL's truncate command.

  > db.stuDetails.remove({})
  WriteResult({ "nRemoved" : 2 })
  >