OCP-1Z0-051-V9.02-150题

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';

所有promo_category 减去包含promo_subcategory = 'discount'的，符合题意。

B. SELECT promo_category

FROM promotions

INTERSECT 交集

SELECT promo_category

FROM promotions

WHERE promo_subcategory = 'discount';

所有promo_category 中包含promo_subcategory = 'discount'的，与题意相反。

C. SELECT promo_category

FROM promotions

MINUS

SELECT promo_category

FROM promotions

WHERE promo_subcategory <> 'discount';

所有promo_category 中减去不包含promo_subcategory = 'discount'的，与题意相反。

 

D. SELECT promo_category

FROM promotions

INTERSECT

SELECT promo_category

FROM promotions

WHERE promo_subcategory <> 'discount';

 

所有promo_category 交集不包含promo_subcategory = 'discount'的，符合题意。

Answer: AD

 

答案解析：

本题意是让找出不包含promo_subcategory = 'discount'的产品。

 

MINUS 返回第一个查询有，第二个查询无的

which returns only unique rows returned by the first query but not by the second

INTERSECT 返回共同有的

which returns only those unique rows returned by both queries