How many players are there for each hand type?
SELECT count(*) ,  hand FROM players GROUP BY hand
SELECT count(*) ,  hand FROM players GROUP BY hand
[{'count(*)': 954, 'hand': ''}, {'count(*)': 487, 'hand': 'L'}, {'count(*)': 5028, 'hand': 'R'}, {'count(*)': 14193, 'hand': 'U'}]