Example 3: Using $ne with Other Operators
The $ne operator can be combined with other operators to perform more complex queries. For example, we can use $ne with $exists to retrieve documents where a field exists but is not null.
db.collection.find({ field: { $exists: true, $ne: null } });
Output:
[
{
"_id": 1,
"name": "Alice",
"age": 20,
"grade": "A"
},
{
"_id": 3,
"name": "Charlie",
"age": 22,
"grade": null
},
{
"_id": 4,
"name": "David",
"age": 23,
"grade": "C"
}
]
Explanation: This query returns documents where the specified field exists and is not null.
How to Query For Is Not Null in MongoDB in a Specific Field?
MongoDB with its flexible document–oriented structure, offers powerful querying capabilities to extract meaningful insights from your data. One common requirement in database querying is to retrieve documents where a specific field is not null.
In this article, We will learn about How to Query For Is Not Null in MongoDB in a Specific Field by understanding various examples with the output in detail.