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How to reach subdata in MongoDB and display a particular document?
In order to reach subdata, you need to use key in MongoDB. Let us create a collection with documents −
>db.demo450.insertOne({"Information":{"StudentDetails":{"StudentName":"Chris","StudentAge":21}}}); { "acknowledged" : true, "insertedId" : ObjectId("5e7b590e71f552a0ebb0a6e6") } >db.demo450.insertOne({"Information":{"StudentDetails":{"StudentName":"David","StudentAge":23}}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7b591a71f552a0ebb0a6e7") } >db.demo450.insertOne({"Information":{"StudentDetails":{"StudentName":"Mike","StudentAge":22}}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7b592271f552a0ebb0a6e8") }
Display all documents from a collection with the help of find() method −
> db.demo450.find();
This will produce the following output −
{ "_id" : ObjectId("5e7b590e71f552a0ebb0a6e6"), "Information" : { "StudentDetails" : { "StudentName" : "Chris", "StudentAge" : 21 } } } { "_id" : ObjectId("5e7b591a71f552a0ebb0a6e7"), "Information" : { "StudentDetails" : { "StudentName" : "David", "StudentAge" : 23 } } } { "_id" : ObjectId("5e7b592271f552a0ebb0a6e8"), "Information" : { "StudentDetails" : { "StudentName" : "Mike", "StudentAge" : 22 } } }
Following is the query to reach subdata in MongoDB −
> db.demo450.find({"Information.StudentDetails.StudentName":"David"});
This will produce the following output −
{ "_id" : ObjectId("5e7b591a71f552a0ebb0a6e7"), "Information" : { "StudentDetails" : { "StudentName" : "David", "StudentAge" : 23 } } }
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