Querying for Null Fields
To query for records where a specific field is null, MongoDB equips us with the powerful combination of the $exists and $eq operators. Let’s embark on a journey to leverage these operators for precise querying.
// Query for records where the field "age" is null
db.collection.find({ "age": { "$exists": true, "$eq": null }});
In this query, we orchestrate a symphony of operators to ensure that the “age” field not only exists within the document but also stands empty, devoid of any assigned value.
How to Query for Records Where Field is Null or Not Set in MongoDB?
MongoDB is a popular NoSQL database known for its flexibility and scalability. When working with MongoDB, you might encounter scenarios where you need to query for records where a specific field is either null or not set. In this article, we’ll explore how to perform such queries in MongoDB, along with detailed examples to illustrate the process.