To delete all records of a collection in MongoDB shell, use the remove() method. The syntax is as follows −
db.yourCollectionName.remove({});
To understand the syntax, let us create a collection with document. The query to create a collection with document is as follows −
> db.deleteAllRecordsDemo.insertOne({"StudentName":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5c8f6ca32f684a30fbdfd596") } > db.deleteAllRecordsDemo.insertOne({"StudentName":"Carol","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c8f6cb22f684a30fbdfd597") } > db.deleteAllRecordsDemo.insertOne({"StudentName":"Mike","StudentAge":23,"Hobby":["Learning","Photography"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c8f6cde2f684a30fbdfd598") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.deleteAllRecordsDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c8f6ca32f684a30fbdfd596"), "StudentName" : "John" } { "_id" : ObjectId("5c8f6cb22f684a30fbdfd597"), "StudentName" : "Carol", "StudentAge" : 21 } { "_id" : ObjectId("5c8f6cde2f684a30fbdfd598"), "StudentName" : "Mike", "StudentAge" : 23, "Hobby" : [ "Learning", "Photography" ] }
Here is the query to delete all records of a collection in MongoDB:
> db.deleteAllRecordsDemo.remove({}); WriteResult({ "nRemoved" : 3 })
Look at the above query, we have deleted all records from a collection. If you try to get records from the above collection, you will get nothing.
The query is as follows −
> db.deleteAllRecordsDemo.find().pretty();
The following is the output −
>