Find sum of fields inside array in MongoDB

Question

I have a data as follows:

> db.PQRCorp.find().pretty()
{
    \"_id\" : 0,
    \"name\" : \"Ancy\",
    \"results\" : [
            {
                    \"eva         


        

Answer 1

You do not need to use $unwind and $group here... A simple $project query can $sum your entire score...

db.PQRCorp.aggregate([
  { "$project": {
    "name": 1,
    "totalTermScore": {
      "$sum": "$results.score"
    }
  }}
])