CREATE TABLE injury_accident (injury VARCHAR, game_id VARCHAR)
CREATE TABLE game (id VARCHAR, season INT)

How many distinct kinds of injuries happened after season 2010?
SELECT COUNT(DISTINCT T1.injury) FROM injury_accident AS T1 JOIN game AS T2 ON T1.game_id = T2.id WHERE T2.season > 2010
SELECT COUNT(DISTINCT "T1"."injury") FROM "injury_accident" AS "T1" JOIN "game" AS "T2" ON "T1"."game_id" = "T2"."id" AND "T2"."season" > 2010