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Calculate average value in MongoDB
To calculate average value in MongoDB, use aggregate() along with $avg. Let us create a collection with documents −
> db.demo159.insertOne({"Score":50});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3557b2fdf09dd6d0853a01")
}
> db.demo159.insertOne({"Score":70});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3557b6fdf09dd6d0853a02")
}
> db.demo159.insertOne({"Score":60});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3557c4fdf09dd6d0853a03")
}Display all documents from a collection with the help of find() method −
> db.demo159.find();
This will produce the following output −
{ "_id" : ObjectId("5e3557b2fdf09dd6d0853a01"), "Score" : 50 }
{ "_id" : ObjectId("5e3557b6fdf09dd6d0853a02"), "Score" : 70 }
{ "_id" : ObjectId("5e3557c4fdf09dd6d0853a03"), "Score" : 60 }Following is the query to calculate $avg value −
> db.demo159.aggregate([{$group: {_id:null, AverageValue: {$avg:"$Score"} } }])This will produce the following output −
{ "_id" : null, "AverageValue" : 60 }
Updated on: 01-Apr-2020
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