SELECT count(*) FROM player WHERE birth_country = 'USA' AND bats  =  'R';
Count the number of players who were born in USA and have bats information 'R'.
SELECT count ( * ) FROM player WHERE birth_country = 'USA ' AND bats = 'R ' ;
select count ( * ) from player where birth_country = value and bats = value
Count the number of players who were born in USA and have bats information 'R ' .