CREATE TABLE table_68956 ("Sport" CLOB, "Competition name" CLOB, "Competing entities" CLOB, "Age groups" CLOB, "Held every" CLOB)

what is the sport when the age group is 21 or younger and the competition name is world youth netball championships?
SELECT "Sport" FROM table_68956 WHERE "Age groups" = '21 or younger' AND "Competition name" = 'world youth netball championships'
SELECT "Sport" FROM "table_68956" WHERE "Age groups" = '21 or younger' AND "Competition name" = 'world youth netball championships'