[{"name":"John","age":19,"hobbies":[{"hobbyName":"Sleeping","proficiency":"Expert"},{"hobbyName":"Coding","proficiency":"Beginner"},{"hobbyName":"Googling","proficiency":"Expert"}]},{"name":"Michael","age":22,"hobbies":[{"hobbyName":"Eating","proficiency":"Expert"}]}]

db.collection.find({"hobbies.hobbyName":{"$all":["Coding","Sleeping"]}})