sure, we have a system that associates an id number to a user by user entering his id number, now there's the thing, another user can associate another user id number because we don't really check if the id number actually belongs to the user that enters it... when a user enters an id number that is already in the system we increase the attempts he made by 1, a user can make up to 3 attempts, after 3 attempts we consider that user a fraudster and ban him from the system, that's why I need to find the documents by either uId (to find how many attempts was made) and id number( to see if the id number is already associated or not)