CREATE TABLE table_name_68 (goals_for INT, wins VARCHAR, goal_difference VARCHAR, club VARCHAR)

What was the average number of 'goals for', scored in the club Real Oviedo that had a 'goal difference' lower than -16 and fewer than 9 wins?
SELECT AVG(goals_for) FROM table_name_68 WHERE goal_difference < -16 AND club = "real oviedo" AND wins < 9
SELECT AVG("goals_for") FROM "table_name_68" WHERE "club" = "real oviedo" AND "goal_difference" < -16 AND "wins" < 9