MongoDB query to 'sort' and display a specific number of values

To sort in MongoDB, use sort(). For displaying only a specific number of values, use LIMIT. Let us create a collection with documents −

> db.demo254.insertOne({"Name":"Chris"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e47a0ab1627c0c63e7dba7f")
}
> db.demo254.insertOne({"Name":"Adam"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e47a0b01627c0c63e7dba80")
}
> db.demo254.insertOne({"Name":"Bob"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e47a0b71627c0c63e7dba81")
}

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

> db.demo254.find();

This will produce the following output −

{ "_id" : ObjectId("5e47a0ab1627c0c63e7dba7f"), "Name" : "Chris" }
{ "_id" : ObjectId("5e47a0b01627c0c63e7dba80"), "Name" : "Adam" }
{ "_id" : ObjectId("5e47a0b71627c0c63e7dba81"), "Name" : "Bob" }

Following is the query to sort −

> db.demo254.find().sort({"Name":1});

This will produce the following output −

{ "_id" : ObjectId("5e47a0b01627c0c63e7dba80"), "Name" : "Adam" }
{ "_id" : ObjectId("5e47a0b71627c0c63e7dba81"), "Name" : "Bob" }
{ "_id" : ObjectId("5e47a0ab1627c0c63e7dba7f"), "Name" : "Chris" }

Following is the query to sort and display only a specific number of records with limit().

> db.demo254.find().sort({"Name":1}).limit(2);

This will produce the following output −

{ "_id" : ObjectId("5e47a0b01627c0c63e7dba80"), "Name" : "Adam" }
{ "_id" : ObjectId("5e47a0b71627c0c63e7dba81"), "Name" : "Bob" }

AmitDiwan

Published on 31-Mar-2020 11:42:52