Get the count of a specific value in MongoDB quickly

For faster queries, create an index. To get the count, use count(). Let us create a collection with documents −

> db.demo311.ensureIndex({"Name":1}); {    "createdCollectionAutomatically" : true,    "numIndexesBefore" : 1,    "numIndexesAfter" : 2,    "ok" : 1 } > db.demo311.insertOne({"Name":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e50cd01f8647eb59e562044") } > db.demo311.insertOne({"Name":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e50cd05f8647eb59e562045") } > db.demo311.insertOne({"Name":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e50cd06f8647eb59e562046") } > db.demo311.insertOne({"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e50cd0af8647eb59e562047") } > db.demo311.insertOne({"Name":"Bob"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e50cd0df8647eb59e562048") } > db.demo311.insertOne({"Name":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e50cd0ff8647eb59e562049") }

Display all documents from a collection with the help of find() method −

> db.demo311.find();

This will produce the following output −

{ "_id" : ObjectId("5e50cd01f8647eb59e562044"), "Name" : "Chris" } { "_id" : ObjectId("5e50cd05f8647eb59e562045"), "Name" : "David" } { "_id" : ObjectId("5e50cd06f8647eb59e562046"), "Name" : "David" } { "_id" : ObjectId("5e50cd0af8647eb59e562047"), "Name" : "Chris" } { "_id" : ObjectId("5e50cd0df8647eb59e562048"), "Name" : "Bob" } { "_id" : ObjectId("5e50cd0ff8647eb59e562049"), "Name" : "Chris" }

Following is the query to get the count of a specific value −

> db.demo311.find({"Name":"Chris"}).count();

This will produce the following output −

3