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MongoDB query for a single field
For a single field, use find(). Let us first create a collection with documents −
> db.demo10.insertOne({"StudentId":101,"StudentName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e0f68a7d7df943a7cec4f9b")
}
> db.demo10.insertOne({"StudentId":102,"StudentName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e0f68afd7df943a7cec4f9c")
}
> db.demo10.insertOne({"StudentId":103,"StudentName":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e0f68b5d7df943a7cec4f9d")
}Following is the query to display all documents from a collection with the help of find() method −
> db.demo10.find();
This will produce the following output −
{ "_id" : ObjectId("5e0f68a7d7df943a7cec4f9b"), "StudentId" : 101, "StudentName" : "Chris" }
{ "_id" : ObjectId("5e0f68afd7df943a7cec4f9c"), "StudentId" : 102, "StudentName" : "David" }
{ "_id" : ObjectId("5e0f68b5d7df943a7cec4f9d"), "StudentId" : 103, "StudentName" : "Bob" }Here is the query for a single field −
> db.demo10.find({},{"_id":0,"StudentId":0});This will produce the following output −
{ "StudentName" : "Chris" }
{ "StudentName" : "David" }
{ "StudentName" : "Bob" }
Updated on: 01-Apr-2020
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