SELECT T1.coupon_amount FROM Discount_Coupons AS T1 JOIN customers AS T2 ON T1.coupon_id  =  T2.coupon_id WHERE T2.good_or_bad_customer  =  'good' INTERSECT SELECT T1.coupon_amount FROM Discount_Coupons AS T1 JOIN customers AS T2 ON T1.coupon_id  =  T2.coupon_id WHERE T2.good_or_bad_customer  =  'bad'
What are the coupon amount of the coupons owned by both good and bad customers?
SELECT T1.coupon_amount FROM Discount_Coupons AS T1 JOIN customers AS T2 ON T1.coupon_id = T2.coupon_id WHERE T2.good_or_bad_customer = 'good ' INTERSECT SELECT T1.coupon_amount FROM Discount_Coupons AS T1 JOIN customers AS T2 ON T1.coupon_id = T2.coupon_id WHERE T2.good_or_bad_customer = 'bad '
select t1 . coupon_amount from discount_coupons as t1 join customers as t2 on t1 . coupon_id = t2 . coupon_id where t2 . good_or_bad_customer = value intersect select t1 . coupon_amount from discount_coupons as t1 join customers as t2 on t1 . coupon_id = t2 . coupon_id where t2 . good_or_bad_customer = value
What are the coupon amount of the coupons owned by both good and bad customers ?