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MongoDB query to calculate average
To calculate average in MongoDB, use $avg. Let us create a collection with documents −
> db.demo80.insertOne({"Details":{"Price":10.5}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bf43271bf0181ecc42297")
}
> db.demo80.insertOne({"Details":{"Price":50.3}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bf43871bf0181ecc42298")
}
> db.demo80.insertOne({"Details":{"Price":100.10}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2bf43f71bf0181ecc42299")
}Display all documents from a collection with the help of find() method −
> db.demo80.find();
This will produce the following output −
{ "_id" : ObjectId("5e2bf43271bf0181ecc42297"), "Details" : { "Price" : 10.5 } }
{ "_id" : ObjectId("5e2bf43871bf0181ecc42298"), "Details" : { "Price" : 50.3 } }
{ "_id" : ObjectId("5e2bf43f71bf0181ecc42299"), "Details" : { "Price" : 100.1 } }Following is the query to get average in MongoDB −
> db.demo80.aggregate([
... {
... "$group": {
... "_id": null,
... "AvgValue": {
... "$avg": "$Details.Price"
... }
... }
... }
... ]);This will produce the following output −
{ "_id" : null, "AvgValue" : 53.633333333333326 }
Updated on: 30-Mar-2020
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