Max and min in mongodb

Question

I have the below DB like entries :

My insert query

 db.collection.insert({company:\"C3\",model:\"M3\",price:55600,discount:9,resolution:\"1         


        

Answer 1

You need to use the .aggregate() method for it to work.

db.collection.aggregate([ 
    { "$group": { 
        "_id": null,
        "max": { "$max": "$price" }, 
        "min": { "$min": "$price" } 
    }}
])

The _id field is mandatory in the $group stage and to find the max/min values for price for the hole collection not for special group it needs to be set to null otherwise the query will only return max/min for each group