This is a common point of confusion for MongoDB beginners! This tutorial shows you exactly how to find documents that have null values versus documents where a field is missing entirely.

What you will learn:

The Default Query { field: null }: We explain how this simple query finds documents where the field is either set to null OR where the field does not exist at all.

How to Find Only Missing Fields: Use the $exists operator to find documents that are missing a specific field (e.g., db.users.find({ email: { $exists: false } })).

How to Find Only null Fields: How to find documents where the field exists but its value is explicitly null (e.g., db.users.find({ email: { $type: "null" } }) or db.users.find({ email: { $eq: null, $exists: true } })).

Understanding this difference is essential for accurate data querying and cleanup!

#MongoDB #Database #NoSQL #Programming #HowTo #TechTips #MongoDBTutorial

YouTube Tags mongodb, mongodb tutorial, mongodb query operators, mongodb null query, mongodb missing fields, mongodb $exists false, mongodb $type null, nosql, database, mongodb find, programming, learn mongodb, mongodb basics, tech tutorial, mongodb query null, mongodb check if field exists, mongodb bson type, mongodb 2025