MongoDB - Delete Document

delete() method

The remove() method of MongoDB is used to remove a document from a collection. The remove() method takes two parameters. One is the removal criteria, and the other is the justOne flag.

• Deletion Criteria - (Optional) The deletion criteria according to the documents will be deleted.

• justOne - (Optional) if set to true or 1, then delete only one document.

Deletion Criteria - (Optional) The deletion criteria according to the documents will be deleted.

justOne - (Optional) if set to true or 1, then delete only one document.

Syntax

The basic syntax of the remove() method is as follows:

>db.COLLECTION_NAME.remove(DELLETION_CRITTERIA)

example

Consider the collection mycol to have the following data.

{ "_id" : ObjectId ( 5983548781331adf45ec5 ), "title" : "MongoDB Overview" } { "_id" : ObjectId ( 5983548781331adf45ec6 ), "title" : "NoSQL Overview" } { "_id" : ObjectId ( 5983548781331adf45ec7 ), "title " : "Tutorials Point Overview" }    
    
    

The following example will delete all documents with the title "Overview of MongoDB".

> db . mycol . remove ({ 'title' : 'MongoDB Overview' }) > db . mycol . find () { "_id" : ObjectId ( 5983548781331adf45ec6 ), "title" : "NoSQL Overview" } { "_id" : ObjectId ( 5983548781331adf45ec7 ), "title" : "Tutorials Point Overview" } >

    
    

Delete only one

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

> db . COLLECTION_NAME . remove ( DELETION_CRITERIA , 1 )

Delete all documents

If you don't specify removal criteria, MongoDB will remove all documents from the collection. This is equivalent to the SQL truncate command.