Aggregation in MongoDB

You can use the following methods to calculate the sum of values in a field in MongoDB: Method 1: Calculate Sum of…

You can use the following methods to calculate the average value of a field in MongoDB: Method 1: Calculate Average of Field…

You can use the following syntax to sort documents in MongoDB by multiple fields: db.myCollection.find().sort( { “field1”: 1, “field2”: -1 } )…

You can use the following syntax to calculate the median value in MongoDB: db.teams.find().sort( {“points”:1} ).skip(db.teams.count() / 2).limit(1); Note that in this…

You can use the following syntax to group documents by date in MongoDB: db.collection.aggregate([ {$group:{ _id:{$dateToString:{format: “%Y-%m-%d”, date: “$day”}}, count:{ $sum: 1}}}…

You can use the following syntax to group by and count in MongoDB: db.collection.aggregate([ {$group : {_id:”$field_name1″, count:{$sum:”$field_name2″}}} ]) Note that field_name1…

You can use the following syntax to find documents with duplicate values in MongoDB: db.collection.aggregate([ {“$group” : { “_id”: “$field1”, “count”: {…

You can use the following syntax to select distinct values from multiple fields in MongoDB: db.collection.aggregate( [ {$group: { “_id”: { field1:…

You can use the following methods to count the distinct values in a specific field in MongoDB: Method 1: Find List of…

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…