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How can I change the field name in MongoDB?
To change the field name, use the $project. Let us create a collection with documents −
> db.demo517.insertOne({"Name":"Chris Brown"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e88a2a2987b6e0e9d18f595")
}
> db.demo517.insertOne({"Name":"David Miller"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e88a2ab987b6e0e9d18f596")
}
> db.demo517.insertOne({"Name":"John Doe"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e88a2b1987b6e0e9d18f597")
}Display all documents from a collection with the help of find() method −
> db.demo517.find();
This will produce the following output −
{ "_id" : ObjectId("5e88a2a2987b6e0e9d18f595"), "Name" : "Chris Brown" }
{ "_id" : ObjectId("5e88a2ab987b6e0e9d18f596"), "Name" : "David Miller" }
{ "_id" : ObjectId("5e88a2b1987b6e0e9d18f597"), "Name" : "John Doe" }Following is the query to change the field name −
> db.demo517.aggregate([{$project:{FullName:"$Name"}}]);This will produce the following output −
{ "_id" : ObjectId("5e88a2a2987b6e0e9d18f595"), "FullName" : "Chris Brown" }
{ "_id" : ObjectId("5e88a2ab987b6e0e9d18f596"), "FullName" : "David Miller" }
{ "_id" : ObjectId("5e88a2b1987b6e0e9d18f597"), "FullName" : "John Doe" }
Updated on: 13-May-2020
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