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MongoDB query to count records on the basis of matching criteria
To count records on the basis of matching criteria, use count(). Let us create a collection with documents −
> db.demo205.insertOne( ... { ... ... "id": "101", ... "Name": "", ... "Age": "", ... "isActive": false ... } ...); { "acknowledged" : true, "insertedId" : ObjectId("5e3d8a3003d395bdc21346eb") } > db.demo205.insertOne( ... { ... ... "id": "102", ... "Name": "Chris", ... "Age": "25", ... "isActive": true ... } ...); { "acknowledged" : true, "insertedId" : ObjectId("5e3d8a3003d395bdc21346ec") } > db.demo205.insertOne( ... { ... ... "id": "103", ... "Name": "", ... "Age": "", ... "isActive": false ... } ...); { "acknowledged" : true, "insertedId" : ObjectId("5e3d8a3003d395bdc21346ed") }
Display all documents from a collection with the help of find() method −
> db.demo205.find();
This will produce the following output −
{ "_id" : ObjectId("5e3d8a3003d395bdc21346eb"), "id" : "101", "Name" : "", "Age" : "", "isActive" : false } { "_id" : ObjectId("5e3d8a3003d395bdc21346ec"), "id" : "102", "Name" : "Chris", "Age" : "25", "isActive" : true } { "_id" : ObjectId("5e3d8a3003d395bdc21346ed"), "id" : "103", "Name" : "", "Age" : "", "isActive" : false }
Following is the query to count records on the basis of matching criteria −
> db.demo205.count({ ... Name: "", ... Age: "", ... "isActive": false ... });
This will produce the following output −
2
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