What is the lowest mark of the rank 8 record?
CREATE TABLE "men_s_best_throwers_of_all_time_current_" (
  "rank" real,
  "mark" real,
  "athlete" text,
  "place" text,
  "date" text
);
SELECT MIN("mark") FROM "men_s_best_throwers_of_all_time_current_" WHERE "rank"=8;