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Ignore null values in MongoDB documents
To ignore null values in MongoDB, use "$ne" : null in aggregate(). Let us create a collection with documents −
> db.demo722.insertOne( ... { ... id:101, ... details: [ ... { Name:""}, ... { Name: "David"}, ... {Name:null}, ... {Name:"Carol"} ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5eab07d543417811278f5889") }
Display all documents from a collection with the help of find() method −
> db.demo722.find();
This will produce the following output −
{ "_id" : ObjectId("5eab07d543417811278f5889"), "id" : 101, "details" : [ { "Name" : "" }, { "Name" : "David" }, { "Name" : null }, { "Name" : "Carol" } ] }
Following is the query to ignore null values in MongoDB using $ne −
> db.demo722.aggregate([ ... {"$unwind": "$details"}, ... ... {"$match": { "details.Name" :{ "$ne" : null } } } ... ])
This will produce the following output −
{ "_id" : ObjectId("5eab07d543417811278f5889"), "id" : 101, "details" : { "Name" : "" } } { "_id" : ObjectId("5eab07d543417811278f5889"), "id" : 101, "details" : { "Name" : "David" } } { "_id" : ObjectId("5eab07d543417811278f5889"), "id" : 101, "details" : { "Name" : "Carol" } }
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