Retrieving array values from a find query in MongoDB database

To retrieve array values from a find query, use dot notation. Let us create a collection with documents −

> db.demo38.insertOne({"ClientDetails":[{"ClientId":101,"ClientName":"Chris"}]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e176abccfb11e5c34d898d9")
}
> db.demo38.insertOne({"ClientDetails":[{"ClientId":102,"ClientName":"David"}]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e176ac7cfb11e5c34d898da")
}
> db.demo38.insertOne({"ClientDetails":[{"ClientId":103,"ClientName":"Mike"}]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e176ad0cfb11e5c34d898db")
}

Display all documents from a collection with the help of find() method −

> db.demo38.find();

This will produce the following output −

{ "_id" : ObjectId("5e176abccfb11e5c34d898d9"), "ClientDetails" : [ { "ClientId" : 101, "ClientName" : "Chris" } ] }
{ "_id" : ObjectId("5e176ac7cfb11e5c34d898da"), "ClientDetails" : [ { "ClientId" : 102, "ClientName" : "David" } ] }
{ "_id" : ObjectId("5e176ad0cfb11e5c34d898db"), "ClientDetails" : [ { "ClientId" : 103, "ClientName" : "Mike" } ] }

Following is the query to retrieve array values from a find query −

> db.demo38.find({"ClientDetails.ClientName":"David"});

This will produce the following output −

{ "_id" : ObjectId("5e176ac7cfb11e5c34d898da"), "ClientDetails" : [ { "ClientId" : 102, "ClientName" : "David" } ] }