OCP-1Z0-051-V9.02-168题

168. View the Exhibit and examine the description of SALES and PROMOTIONS tables.

You want to delete rows from the SALES table, where the PROMO_NAME column in the PROMOTIONS

table has either blowout sale or everyday low price as values.

Which DELETE statements are valid? (Choose all that apply.)

delete from sales

where promo_id=(select promo_id from promotions where)

 

A. DELETE FROM sales

WHERE promo_id = (SELECT promo_id                  

FROM promotions                  

WHERE promo_name = 'blowout sale')

AND promo_id = (SELECT promo_id                  

FROM promotions                  

WHERE promo_name = 'everyday low price');

B. DELETE FROM sales

WHERE promo_id = (SELECT promo_id                  

FROM promotions                  

WHERE promo_name = 'blowout sale')

OR promo_id = (SELECT promo_id                  

FROM promotions                  

WHERE promo_name = 'everyday low price');

C. DELETE FROM sales

WHERE promo_id IN (SELECT promo_id                   

FROM promotions                   

WHERE promo_name = 'blowout sale'                   

OR promo_name = 'everyday low price');

D. DELETE FROM sales

WHERE promo_id IN (SELECT promo_id                   

FROM promotions                   

WHERE promo_name IN ('blowout sale','everyday low price'));

Answer: BCD

答案解析：

题意要求：从SALES表中删除行，条件为PROMOTIONS表中PROMO_NAM列的值为blowout sale或者everyday low price）

BCD这三个选项是等价的。

而A的where条件中的AND不满足题意要求。