mongodb : remove(): Delete document

“remove” method is used to delete documents from a collection.

db.collection.remove(

   <query>,

   {

     justOne: <boolean>,

     writeConcern: <document>

   }

)

Parameter	Type	Description
query	document	Specifies deletion criteria using query operators. To delete all documents in a collection, pass an empty document ({}).
justOne	boolean	Optional. To limit the deletion to just one document, set to true. Omit to use the default value of false and delete all documents matching the deletion criteria.
writeConcern	document	Optional. A document expressing the write concern. Omit to use the default write concern

> db.employee.find()
{ "_id" : ObjectId("54b2a8c9dbf1847bed465758"), "id" : 1, "firstName" : "Hari Krishna", "lastName" : "Gurram" }
{ "_id" : 2, "firstName" : "Rama Krishna", "lastName" : "Gurram" }
{ "_id" : ObjectId("54b2aa07dbf1847bed465759"), "id" : 1, "firstName" : "Jessi", "lastName" : "chelli" }
{ "_id" : ObjectId("54b2aa07dbf1847bed46575a"), "id" : 2, "firstName" : "Ananad", "lastName" : "Bandaru" }
{ "_id" : ObjectId("54b2aa07dbf1847bed46575b"), "id" : 3, "firstName" : "Gopi", "lastName" : "Battu" }
{ "_id" : ObjectId("54b2aa07dbf1847bed46575c"), "id" : 4, "firstName" : "Ritwik", "lastName" : "Mohenthy" }
>
>
> db.employee.remove({ id: { $gt: 1 } })
WriteResult({ "nRemoved" : 3 })
>
>
> db.employee.find()
{ "_id" : ObjectId("54b2a8c9dbf1847bed465758"), "id" : 1, "firstName" : "Hari Krishna", "lastName" : "Gurram" }
{ "_id" : 2, "firstName" : "Rama Krishna", "lastName" : "Gurram" }
{ "_id" : ObjectId("54b2aa07dbf1847bed465759"), "id" : 1, "firstName" : "Jessi", "lastName" : "chelli" }
>

To remove all documents

“db.employee.remove({})” remove all documents from collection employee.

> db.employee.find()
{ "_id" : ObjectId("54b2a8c9dbf1847bed465758"), "id" : 1, "firstName" : "Hari Krishna", "lastName" : "Gurram" }
{ "_id" : 2, "firstName" : "Rama Krishna", "lastName" : "Gurram" }
{ "_id" : ObjectId("54b2aa07dbf1847bed465759"), "id" : 1, "firstName" : "Jessi", "lastName" : "chelli" }
>
>
> db.employee.remove({})
WriteResult({ "nRemoved" : 3 })
>
> db.employee.find()
>

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