150.View the Exhibit and examine the data in the PROMOTIONS table.

150.View the Exhibit and examine the data in the PROMOTIONS table.

You need to display all promo categories that do not have 'discount' in their subcategory.

Which two SQL statements give the required result? (Choose two.)
A.SELECT promo_category FROM promotions
MINUS
SELECT promo_category FROM promotions
WHERE promo_subcategory = 'discount';
B.SELECT promo_category FROM promotions
INTERSECT
SELECT promo_category FROM promotions
WHERE promo_subcategory = 'discount';
C.SELECT promo_category FROM promotions
MINUS
SELECT promo_category FROM promotions
WHERE promo_subcategory <> 'discount';
D.SELECT promo_category FROM promotions
INTERSECT
SELECT promo_category FROM promotions
WHERE promo_subcategory <> 'discount';
答案：AD
解析：这里考察的是INTERSECT和MINUS
INTERSECT：获取a表和b表的交集
MINUS：获取a表中排除b表数据的集合
题目说的是不包含discount的数据，那么
A:正确,总的数据减去包含discount的数据，剩下的也就是不包含的数据了
B:错误,总的数据与包含discount的数据的交集，也就是包含discount的数据
C:错误,总的数据减去不包含discount的数据，剩下的也就是包含的数据了
D:正确,总的数据与不包含discount的数据的交集，也就是不包含discount的数据