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How to add a column in MongoDB collection?
To add a column, you need to update the collection. The syntax is as follows −
db.getCollection(yourCollectionName).update({}, {$set: {"yourColumnName": "yourValue"}},false,true);To understand the above syntax, let us create a collection with documents −
> db.addColumnDemo.insertOne({"StudentId":101,"StudentName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04d66af5e889d7a519950f")
}
> db.addColumnDemo.insertOne({"StudentId":102,"StudentName":"Robert"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04d673f5e889d7a5199510")
}
> db.addColumnDemo.insertOne({"StudentId":103,"StudentName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04d67bf5e889d7a5199511")
}Following is the query to display all documents from a collection with the help of find() method −
> db.addColumnDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e04d66af5e889d7a519950f"),
"StudentId" : 101,
"StudentName" : "Chris"
}
{
"_id" : ObjectId("5e04d673f5e889d7a5199510"),
"StudentId" : 102,
"StudentName" : "Robert"
}
{
"_id" : ObjectId("5e04d67bf5e889d7a5199511"),
"StudentId" : 103,
"StudentName" : "David"
}Here is the query to add a column in MongoDB −
> db.getCollection('addColumnDemo').update({}, {$set: {"StudentCityName": "New York"}},false,true);
WriteResult({ "nMatched" : 3, "nUpserted" : 0, "nModified" : 3 })Following is the query to display all documents from a collection with the help of find() method −
> db.addColumnDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e04d66af5e889d7a519950f"),
"StudentId" : 101,
"StudentName" : "Chris",
"StudentCityName" : "New York"
}
{
"_id" : ObjectId("5e04d673f5e889d7a5199510"),
"StudentId" : 102,
"StudentName" : "Robert",
"StudentCityName" : "New York"
}
{
"_id" : ObjectId("5e04d67bf5e889d7a5199511"),
"StudentId" : 103,
"StudentName" : "David",
"StudentCityName" : "New York"
}
Updated on: 27-Mar-2020
8K+ Views
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