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MongoDB query to group records and display a specific value with dot notation
Let us create a collection with documents −
> db.demo430.insertOne( ... { ... "details": [ ... { ... "Name":"Chris" ... } , ... {"Name":"David"}, ... {"Name":"Adam"}, ... {"Name":"Bob"} ... ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e7702ddbbc41e36cc3cae88") }
Display all documents from a collection with the help of find() method −
> db.demo430.find();
This will produce the following output −
{ "_id" : ObjectId("5e7702ddbbc41e36cc3cae88"), "details" : [ { "Name" : "Chris" }, { "Name" : "David" }, { "Name" : "Adam" }, { "Name" : "Bob" } ] }
Following is the query to group records −
> db.demo430.aggregate([{ "$group" : { "_id" : {"Name" : "$details.Name"}}}]);
This will produce the following output −
{ "_id" : { "Name" : [ "Chris", "David", "Adam", "Bob" ] } }
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