List the names of players that do not have coaches.
SELECT Player_name FROM player WHERE Player_ID NOT IN (SELECT Player_ID FROM player_coach)
SELECT Player_name FROM player WHERE Player_ID NOT IN (SELECT Player_ID FROM player_coach)
[{'Player_name': 'Jim Maloway'}, {'Player_name': 'Mohamed Alli'}, {'Player_name': 'Ross C. Martin'}, {'Player_name': 'Matt Schaubroeck'}, {'Player_name': 'Pat Martin'}, {'Player_name': 'Judy Wasylycia-Leis'}, {'Player_name': 'Sean Robert'}]