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Display the last two values from field with MongoDB
Let us first create a collection with documents −
> db.numberOfValuesDemo.insertOne({"Values":[100,200,300,900,1000,98]}); { "acknowledged" : true, "insertedId" : ObjectId("5cefb736ef71edecf6a1f6ab") }
Display all documents from a collection with the help of find() method −
> db.numberOfValuesDemo.find().pretty();
Output
{ "_id" : ObjectId("5cefb736ef71edecf6a1f6ab"), "Values" : [ 100, 200, 300, 900, 1000, 98 ] }
Following is the query to get the last two values.
Here, we have used -ve sign under $slice −
> db.numberOfValuesDemo.find({},{ "Values": { "$slice": -2 } } );
Output
{ "_id" : ObjectId("5cefb736ef71edecf6a1f6ab"), "Values" : [ 1000, 98 ] }
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