What are the id and name of the stadium where the most injury accidents happened?
SELECT T1.id ,  T1.name FROM stadium AS T1 JOIN game AS T2 ON T1.id  =  T2.stadium_id JOIN injury_accident AS T3 ON T2.id  =  T3.game_id GROUP BY T1.id ORDER BY count(*) DESC LIMIT 1
most injury accidents happened refers to MAX(COUNT(injury_accident)); id and name of the stadium refers to SELECT T1.id, T1.name; where the accidents happened refers to JOIN on stadium and game tables and further joining with injury_accident table;