Aggregation in MongoDB

You can use the following methods to sort documents by a date field in MongoDB: Method 1: Sort by Date Ascending db.sales.find().sort({“date_field”:…

You can use the following syntax to group by multiple fields and perform some aggregation in MongoDB: db.collection.aggregate([ {$group : {_id:{field1:”$field1″, field2:”$field2″},…

You can use the following syntax to group by and count in MongoDB: db.collection.aggregate([ {$group : {_id:”$field_name”, count:{$sum:1}}} ]) Note that field_name…