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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" ] } }
Updated on: 03-Apr-2020
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