MongoDB collection query to exclude some fields in find()?

MongoDBDatabaseBig Data Analytics

Set the fields you don’t want to include as 0 as in the below syntax. Here, we have set fields “yourFieldName1” and “yourFieldName2” as 0 −

db.yourCollectionName.find(yourQuery, {yourFieldName1:0,yourFieldName2:0});

To understand the above syntax, let us create a collection with documents −

> db.demo567.insertOne({"Name":"Chris",Age:21});{
   "acknowledged" : true, "insertedId" : ObjectId("5e908fa139cfeaaf0b97b57b")
}
> db.demo567.insertOne({"Name":"David",Age:23});{
   "acknowledged" : true, "insertedId" : ObjectId("5e908fa939cfeaaf0b97b57c")
}
> db.demo567.insertOne({"Name":"Bob",Age:22});{
   "acknowledged" : true, "insertedId" : ObjectId("5e908faf39cfeaaf0b97b57d")
}
> db.demo567.insertOne({"Name":"Carol",Age:20});{
   "acknowledged" : true, "insertedId" : ObjectId("5e908fb539cfeaaf0b97b57e")
}

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

> db.demo567.find();

This will produce the following output −

{ "_id" : ObjectId("5e908fa139cfeaaf0b97b57b"), "Name" : "Chris", "Age" : 21 }
{ "_id" : ObjectId("5e908fa939cfeaaf0b97b57c"), "Name" : "David", "Age" : 23 }
{ "_id" : ObjectId("5e908faf39cfeaaf0b97b57d"), "Name" : "Bob", "Age" : 22 }
{ "_id" : ObjectId("5e908fb539cfeaaf0b97b57e"), "Name" : "Carol", "Age" : 20 }

Following is the query to exclude some fields in find() −

> db.demo567.find({Name:{$in:["Chris","Bob"]}}, {Age:0,_id:0});

This will produce the following output −

{ "Name" : "Chris" }
{ "Name" : "Bob" }
raja
Published on 14-May-2020 08:35:08
Advertisements