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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 ] }
Updated on: 30-Jul-2019
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