[{"product_id":1,"product_name":"Sugar","quantity":100},{"product_id":1,"product_name":"Sugar","quantity":-100},{"product_id":3,"product_name":"Flour","quantity":50},{"product_id":3,"product_name":"Flour","quantity":-50},{"product_id":4,"product_name":"Water","quantity":100},{"product_id":5,"product_name":"Water","quantity":100}]

db.collection.find()