Syntax error Select special fields rather than all in MongoDB

Select special fields rather than all in MongoDB

For this, simply use find(). Set the fields you don’t want to select to 0. Let us create a collection with documents −

> db.demo269.insertOne({StudentId:101,StudentSubject:"MySQL"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e481caa1627c0c63e7dbab4")
}
> db.demo269.insertOne({StudentId:102,StudentSubject:"Java"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e481cb11627c0c63e7dbab5")
}
> db.demo269.insertOne({StudentId:103,StudentSubject:"MongoDB"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e481cb21627c0c63e7dbab6")
}
> db.demo269.insertOne({StudentId:104,StudentSubject:"C"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e481cb21627c0c63e7dbab7")
}

Display all documents from a collection with the help of find() method −

> db.demo269.find();

This will produce the following output −

{ "_id" : ObjectId("5e481caa1627c0c63e7dbab4"), "StudentId" : 101, "StudentSubject" : "MySQL" }
{ "_id" : ObjectId("5e481cb11627c0c63e7dbab5"), "StudentId" : 102, "StudentSubject" : "Java" }
{ "_id" : ObjectId("5e481cb21627c0c63e7dbab6"), "StudentId" : 103, "StudentSubject" : "MongoDB" }
{ "_id" : ObjectId("5e481cb21627c0c63e7dbab7"), "StudentId" : 104, "StudentSubject" : "C" }

Following is the query to select only specific fields rather than all −

> db.demo269.find({},{"StudentId":0,_id:0});

This will produce the following output −

{ "StudentSubject" : "MySQL" }
{ "StudentSubject" : "Java" }
{ "StudentSubject" : "MongoDB" }
{ "StudentSubject" : "C" }
Updated on: 2020-03-31T08:46:24+05:30

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