error in frontend_closed_day_to_array:
SELECT d.main_c_d_day_name
FROM main_closed_day d, golf_closed_relation r, golf_course_data c
WHERE r.Golf_Course_ID = c.Golf_Course_ID
AND r.Main_Closed_ID = d.main_c_d_no
AND r.Golf_Course_ID = '100'
ORDER BY main_c_d_no