How to find exact Array Match with values in different order using MongoDB?

MongoDBDatabaseBig Data Analytics

To find exact array match with values in different order, you can use $all operator. Let us create a collection with documents. Following is the query

>db.exactMatchArrayDemo.insertOne({"StudentName":"David","StudentAge":22,"StudentGameScores":[45,78,98]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5c9c94702d6669774125246c")
}
>db.exactMatchArrayDemo.insertOne({"StudentName":"Chris","StudentAge":23,"StudentGameScores":[45,78]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5c9c94a42d6669774125246d")
}

Following is the query to display all documents from a collection with the help of find() method

> db.exactMatchArrayDemo.find().pretty();

This will produce the following output

{
   "_id" : ObjectId("5c9c94702d6669774125246c"),
   "StudentName" : "David",
   "StudentAge" : 22,
   "StudentGameScores" : [
      45,
      78,
      98
   ]
}
{
   "_id" : ObjectId("5c9c94a42d6669774125246d"),
   "StudentName" : "Chris",
   "StudentAge" : 23,
   "StudentGameScores" : [
      45,
      78
   ]
}

Following is the query to find exact array match

> db.exactMatchArrayDemo.find({ "StudentGameScores": { "$size" : 2, "$all": [ 78, 45 ] } }).pretty();

This will produce the following output

{
   "_id" : ObjectId("5c9c94a42d6669774125246d"),
   "StudentName" : "Chris",
   "StudentAge" : 23,
   "StudentGameScores" : [
      45,
      78
   ]
}

Following is the query to find exact array match but order does not matter. We have set a different size to get the field “StudentGameScores” with 3 values

> db.exactMatchArrayDemo.find({ "StudentGameScores": { "$size" : 3, "$all": [ 78, 45 ] } }).pretty();

This will produce the following output

{
   "_id" : ObjectId("5c9c94702d6669774125246c"),
   "StudentName" : "David",
   "StudentAge" : 22,
   "StudentGameScores" : [
      45,
      78,
      98
   ]
}
raja
Published on 12-Apr-2019 07:19:53
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