Aggregate Pipelines Mongodb

https://www.youtube.com/watch?v=Kk6Er0c7srU
Aggregate Pipelines Mongodb

db.purchase_orders.aggegate(
	[
		{$match : {customer : {$in : ["Mike", "Karen"]}}}
		{$group : {
			_id: "$product",
			total:{$sum : "$total"}
			}
		}
		{$sort  : {total : -1}}
	]
)