How to get embedded data in a MongoDB document?

Following is the syntax to get the embedded data in a MongoDB document

db.yourCollectionName.find({},{‘yourOuterKeyName.yourInnerKeyName:1}).pretty();

Let us first create a collection with documents

> db.embeddedCollectionDemo.insertOne( ...    { ...       "StudentName" : "Larry", ...       "StudentDetails": { ...          "Larry1234": {"ProjectName": "Student Web Tracker"}, ...          "Larry7645": {"ProjectName": "Hospital Management System"}, ...          "Larry9879": {"ProjectName": "Library Management System"}, ... ...       } ...    } ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5c98a100330fd0aa0d2fe4c5") }

Following is the query to display all documents from a collection

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

This will produce the following output

{    "_id" : ObjectId("5c98a100330fd0aa0d2fe4c5"),    "StudentName" : "Larry",    "StudentDetails" : {       "Larry1234" : {          "ProjectName" : "Student Web Tracker"       },       "Larry7645" : {          "ProjectName" : "Hospital Management System"       },       "Larry9879" : {          "ProjectName" : "Library Management System"       }    } }

Following is the query for embedded collections i.e. embedded data in MongoDB collection

> db.embeddedCollectionDemo.find({},{'StudentDetails.Larry7645':1}).pretty();

This will produce the following output

{    "_id" : ObjectId("5c98a100330fd0aa0d2fe4c5"),    "StudentDetails" : {       "Larry7645" : {          "ProjectName" : "Hospital Management System"       }    } }