MongoDB query Remove/Delete records in a Collection
Today in this article, we will cover how to write MongoDB query Remove/Delete records in a Collection. We will see a simple query to delete all the records and also delete records based on filter criteria.
We will use the Mongo Shell query to perform the deletes. If you are interested to perform delete within Atlas UI compass please refer to this article.
You may find the need to delete the records from a mongo collection from time to time, especially when performing the schema update or data cleanup.
While dropping the collection is another easier way to delete the records which not only deletes the collection but also deletes all the records along with indexes if any.
MongoDB Delete All records
But if you want to delete the records without deleting the collection or indexes then you can use the below command from the mongo shell
Switch to the Database
Switch to the Database using the command “use”
Command :
use <Your DB>
Example
Delete all records using deleteMany
We can easily delete all records using deleteMany() method
Command
db.<collection name>.deleteMany({})
Example
db.employee1.deleteMany({})
Delete records for filter criteria using deleteMany methods
Example 1:
db.employee1.deleteOne({Name:"Meery"})
Above query will delete the first matching records(Where Name fields match the value as “Merry” ) for the given filter condition
Example 2:
db.employee1.deleteMany({Name:"Meery"})
The above query will delete all matching records(one or multiple) for the given filter condition.
Delete all records using remove() methods
We can also easily delete all records using remove() method.
Command
db.<collection name>.remove({})
Example 1
db.employee1.remove({})
Delete records for filter criteria using remove() methods
Example
db.employee1.remove({Name:"John"})
Above query will remove records where Name fields match with value of “John”
Delete records using the Unset operator
One can also delete the records using unset operator too.
For more details please visit below,
References :
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