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How to use ORDERBY in MongoDB if there are possible null values?
If there are null values also, then implement ORDERBY using sort().
Note − Since, starting in MongoDB v3.2, the $orderby operator deprecated in the mongo shell. Use cursor.sort() instead.
Let us create a collection with documents −
> db.demo530.insertOne({"Name":"Chris"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b2990ef4dcbee04fbbbec")
}
> db.demo530.insertOne({"Name":null});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b2991ef4dcbee04fbbbed")
}
> db.demo530.insertOne({"Name":"David"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b2992ef4dcbee04fbbbee")
}
> db.demo530.insertOne({"Name":"Adam"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b2995ef4dcbee04fbbbef")
}
> db.demo530.insertOne({"Name":null});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b2999ef4dcbee04fbbbf0")
}
> db.demo530.insertOne({"Name":"Carol"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b299eef4dcbee04fbbbf1")
}
Display all documents from a collection with the help of find() method −
> db.demo530.find();
This will produce the following output −
{ "_id" : ObjectId("5e8b2990ef4dcbee04fbbbec"), "Name" : "Chris" }
{ "_id" : ObjectId("5e8b2991ef4dcbee04fbbbed"), "Name" : null }
{ "_id" : ObjectId("5e8b2992ef4dcbee04fbbbee"), "Name" : "David" }
{ "_id" : ObjectId("5e8b2995ef4dcbee04fbbbef"), "Name" : "Adam" }
{ "_id" : ObjectId("5e8b2999ef4dcbee04fbbbf0"), "Name" : null }
{ "_id" : ObjectId("5e8b299eef4dcbee04fbbbf1"), "Name" : "Carol" }
Following is the query to implement ORDERBY in MongoDB if there are null values also using sort() −
> db.demo530.aggregate([
... {$match: {"Name": {$exists: true}}}
... ,
... {$sort: { "Name": 1}}
... ]);
This will produce the following output −
{ "_id" : ObjectId("5e8b2991ef4dcbee04fbbbed"), "Name" : null }
{ "_id" : ObjectId("5e8b2999ef4dcbee04fbbbf0"), "Name" : null }
{ "_id" : ObjectId("5e8b2995ef4dcbee04fbbbef"), "Name" : "Adam" }
{ "_id" : ObjectId("5e8b299eef4dcbee04fbbbf1"), "Name" : "Carol" }
{ "_id" : ObjectId("5e8b2990ef4dcbee04fbbbec"), "Name" : "Chris" }
{ "_id" : ObjectId("5e8b2992ef4dcbee04fbbbee"), "Name" : "David" }
Updated on: 2020-05-13T07:43:43+05:30
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