Aggregate query with where condition

Question

How could the following SQL query be converted for Mongo:

SELECT KeyID, SUM(Qty)
FROM Table
WHERE Date <= \'1998-12-01         


        

Answer 1

Can use this -

db.schoolexamregistration.aggregate([
    { $match: {"exam_session_id":"1523850138707"} },{
     $lookup:
       {
         from: "student",
         localField: "nic_ppt",
         foreignField: "nic_ppt",
         as: "student_detail"
       }
    }
  ])