Who had the fasted lap in motorsport arena oschersleben?
CREATE TABLE "race_calendar_and_results" (
  "round" real,
  "circuit" text,
  "date" text,
  "pole_position" text,
  "fastest_lap" text,
  "winning_driver" text,
  "winning_team" text
);
SELECT "fastest_lap" FROM "race_calendar_and_results" WHERE "circuit"='Motorsport Arena Oschersleben';