CREATE TABLE table_name_4 (goal_difference VARCHAR, goals_against VARCHAR, played VARCHAR)

Tell me the totla number of goal difference for goals against of 30 and played less than 18
SELECT COUNT(goal_difference) FROM table_name_4 WHERE goals_against = 30 AND played < 18
SELECT COUNT("goal_difference") FROM "table_name_4" WHERE "goals_against" = 30 AND "played" < 18