SELECT preferred_foot ,  avg(overall_rating) FROM Player_Attributes GROUP BY preferred_foot
What is the average rating for right-footed players and left-footed players?
SELECT preferred_foot , avg ( overall_rating ) FROM Player_Attributes GROUP BY preferred_foot
select preferred_foot , avg ( overall_rating ) from player_attributes group by preferred_foot
What is the average rating for right-footed players and left-footed players ?