Database
[{"EmployeeID":"Cust0001","Point":1,},{"EmployeeID":"Cust0002","Point":2,},{"EmployeeID":"Cust0003","Point":1,},{"EmployeeID":"Cust0001","Point":5,},{"EmployeeID":"Cust0001","Point":2,}]
Query
db.collection.aggregate([{$group:{_id:"$EmployeeID",Point:{$sum:{$sum:"$Point"}}}},{$project:{EmployeeID:"$_id",Point:"$Point",_id:0}}])