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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
Updated on: 2020-03-27T10:43:12+05:30
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