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MongoDB query to add up the values of a specific field in documents
Let us create a collection with documents −
> db.demo677.insertOne({Value:10});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea421f404263e90dac943f8")
}
> db.demo677.insertOne({Value:50});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea421f704263e90dac943f9")
}
> db.demo677.insertOne({Value:20});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea421fa04263e90dac943fa")
}
> db.demo677.insertOne({Value:20});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea421fe04263e90dac943fb")
}Display all documents from a collection with the help of find() method −
> db.demo677.find();
This will produce the following output −
{ "_id" : ObjectId("5ea421f404263e90dac943f8"), "Value" : 10 }
{ "_id" : ObjectId("5ea421f704263e90dac943f9"), "Value" : 50 }
{ "_id" : ObjectId("5ea421fa04263e90dac943fa"), "Value" : 20 }
{ "_id" : ObjectId("5ea421fe04263e90dac943fb"), "Value" : 20 }Following is the query to add up the values of a specific field −
> db.demo677.aggregate({ $group: { _id : null, sum : { $sum: "$Value" } } });This will produce the following output −
{ "_id" : null, "sum" : 100 }
Updated on: 13-May-2020
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