Which team had the most players in the all star games?
select * from all_star group by team_id order by count ( * ) desc limit 1
WHich player has the most all star games played?
select * from player as t1 join all_star as t2 on t1.player_id = t2.player_id group by t1.player_id order by count ( * ) desc limit 1
What is his id?
select t1.player_id from player as t1 join all_star as t2 on t1.player_id = t2.player_id group by t1.player_id order by count ( * ) desc limit 1