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0 Delete Document in MongoDB
MongoDB provides the following methods to delete one or more documents in a collection.
- db.collection.deleteOne() – Deletes the first matching document in a collection.
- db.collection.deleteMany() – Deletes all the matching documents in a collection.
Use the db.<collection>.deleteOne() method to delete the first documents that match with the specified filter criteria in a collection.
Syntax:
db.collection.deleteOne(filter, options)
Parameters:
- filter: The selection criteria for the update, same as find() method.
- options: Optional. May contains options for update behavior. It includes writeConcern, collation, and hint parameters.
In the above syntax, db points to the current database, <collection> points is an existing collection name.
To demonstrate the delete operation, insert the following sample documents in the employees collection.
Sample Data
db.employees.insertMany([
{
_id:1,
firstName: "John",
lastName: "King",
email: "john.king@abc.com",
salary: 5000
},
{
_id:2,
firstName: "Sachin",
lastName: "T",
email: "sachin.t@abc.com",
salary: 8000
},
{
_id:3,
firstName: "James",
lastName: "Bond",
email: "jamesb@abc.com",
salary: 7500
},
{
_id:4,
firstName: "Steve",
lastName: "J",
email: "steve.j@abc.com",
salary: 7000
},
{
_id:5,
firstName: "Kapil",
lastName: "D",
email: "kapil.d@abc.com",
salary: 4500
},
{
_id:6,
firstName: "Amitabh",
lastName: "B",
email: "amitabh.b@abc.com",
salary: 7000
}
])
The following deletes a document from the employees collection.
Example: Delete Single Document using deleteOne()
db.employees.deleteOne({ salary:7000 })
Output
{ acknowledged: true, deletedCount: 1 }
The above command deletes the first matching document even if multiple documents match with the specified criteria.
deleteMany()
Use the db.<collection>.deleteMany() method to delete all the documents that match with the specified filter criteria in a collection.
Syntax:
db.collection.deleteMany(filter, options)
Parameters:
- filter: The selection criteria for the update, same as find() method.
- options: Optional. May contains options for update behavior. It includes writeConcern and collation, and hint parameters.
The following deletes all documents from the employees collection that match with the specified criteria.
Example: deleteMany()
db.employees.deleteMany({ salary:7000 })
Output
{ acknowledged: true, deletedCount: 2 }
The following deletes all documents where salary is less than 7000.
Example: deleteMany()
db.employees.deleteMany({ salary: { $lt:7000} })
Output
{ acknowledged: true, deletedCount: 2 }
If you specify an empty criteria then it will delete all documents in a collection.
Example: Delete All Documents
db.employees.deleteMany({ }) //deletes all documents
Output
{ acknowledged: true, deletedCount: 6 }Credit: Delete Documents — MongoDB Manual
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