db={"teams":[{team:"Manchester City",position:"1st",points:70},{team:"Liverpool",position:null,points:69},{team:"Chelsea",position:"3rd",points:59},{team:"Arsenal",position:"4th",points:null},{team:"Tottenham",position:"5th",points:51},{team:"Manchester United",position:"6th",points:50},{team:"West Ham",position:"",points:48},{team:"Wolves",position:"",points:46}]}

db.teams.find({position:{$ne:""}})