database - MongoDB using $exists and $and still return documents without field - Stack Overflow
MongoDB - Check the existence of the fields in the specified collection - GeeksforGeeks
Check if a Field Exists in MongoDB | Delft Stack
MongoDB check if a field exists in a document
exists — MongoDB Manual
Querying MongoDB documents | Prisma's Data Guide
Filter documents where 'type' field doesn't exists not working · Issue #218 · loopbackio/loopback-connector-mongodb · GitHub
23 Common MongoDB Operators & How To Use Them – BMC Software | Blogs
An Introduction to MongoDB Query for Beginners
javascript - Mongodb check If field exists in an sub-document of an array - Stack Overflow
MongoDB AND operator ( $and ) - GeeksforGeeks
MongoDB - Missing discriminator array when doing upserts with UpdateOneModel
MongoDB insert if not exists - Spark By {Examples}
JSON Query Expression Functions — MongoDB Connected System 1.1 documentation
Filter Chart Results — MongoDB Charts
MongoDB $exists Operator: Check if a Field Exists | CodeForGeek
MongoDB Query Language
node.js - MongoDB update object in array if exists or push - Stack Overflow
Indexes — MongoDB Manual
How to use $exists operator in MongoDB
MongoDB - Check the existence of the fields in the specified collection - GeeksforGeeks
How to find a document in a mongo collection based on whether a field exists or not | Learn with Param
All about MongoDB's _id Field
How to Find & Filter MongoDB Array Elements Using $elemMatch
Query for Null or Missing Fields — MongoDB Manual
Set Validation Rules for Your Schema — MongoDB Compass
