Particular field as result in MongoDB?

To get particular field as a result in MongoDB, you can use findOne(). Following is the syntax −

db.yourCollectionName.findOne({"yourFieldName1":yourValue},{yourFieldName2:1});

Let us first create a collection with documents −

> db.particularFieldDemo.insertOne({"EmployeeName":"John Smith","EmployeeAge":26,"EmployeeTechnology":"MongoDB"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd9b4abb50a6c6dd317ada2") } > db.particularFieldDemo.insertOne({"EmployeeName":"Chris Brown","EmployeeAge":28,"EmployeeTechnology":"Java"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd9b4d2b50a6c6dd317ada3") } > db.particularFieldDemo.insertOne({"EmployeeName":"David Miller","EmployeeAge":30,"EmployeeTechnology":"MySQL"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd9b4e8b50a6c6dd317ada4") } > db.particularFieldDemo.insertOne({"EmployeeName":"John Doe","EmployeeAge":31,"EmployeeTechnology":"C++"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd9b527b50a6c6dd317ada5") }

Following is the query to display all documents from a collection with the help of find() method −

> db.particularFieldDemo.find().pretty();

This will produce the following output −

{    "_id" : ObjectId("5cd9b4abb50a6c6dd317ada2"),    "EmployeeName" : "John Smith",    "EmployeeAge" : 26,    "EmployeeTechnology" : "MongoDB" } {    "_id" : ObjectId("5cd9b4d2b50a6c6dd317ada3"),    "EmployeeName" : "Chris Brown",    "EmployeeAge" : 28,    "EmployeeTechnology" : "Java" } {    "_id" : ObjectId("5cd9b4e8b50a6c6dd317ada4"),    "EmployeeName" : "David Miller",    "EmployeeAge" : 30,    "EmployeeTechnology" : "MySQL" } {    "_id" : ObjectId("5cd9b527b50a6c6dd317ada5"),    "EmployeeName" : "John Doe",    "EmployeeAge" : 31,    "EmployeeTechnology" : "C++" }

Following is the query to find particular field as result in MongoDB −

> db.particularFieldDemo.findOne({"EmployeeTechnology":"Java"},{EmployeeName:1});

This will produce the following output −

{    "_id" : ObjectId("5cd9b4d2b50a6c6dd317ada3"),    "EmployeeName" : "Chris Brown" }