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MongoDB query to slice only one element of array
To slice only one element of array, use $slice in MongoDB. Let us create a collection with documents −
> db.demo579.insertOne(
... {
... "_id" : 101,
... "details" : { "FirstName" : "John" },
... "Marks" : [ 56,78,90,34,45,74 ]
... }
... );
{ "acknowledged" : true, "insertedId" : 101 }Display all documents from a collection with the help of find() method −
> db.demo579.find().pretty();
This will produce the following output −
{
"_id" : 101,
"details" : {
"FirstName" : "John"
},
"Marks" : [
56,
78,
90,
34,
45,
74
]
}Following is the query to slice only one the element of the array −
> db.demo579.find({},{Marks : {$slice : 1} ,"details":0,"_id":0})This will produce the following output −
{ "Marks" : [ 56 ] }
Updated on: 15-May-2020
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