text: DO $$
  DECLARE
      random_value integer := 0;
  BEGIN
  	FOR i in 1..20000 LOOP
  	    random_value := floor(random() * 10000 + 1);
  		UPDATE task3
  	        SET name = md5(cast(random_value * 2 AS text))
  	        WHERE id = random_value;
  	END LOOP;
  END;
  $$;
  