（99）View the Exhibit and examine the structure of the PROMOTIONS table.

Using the PROMOTIONS table, you need to find out the average cost for all promos in the ranges $0-2000 and $2000-5000 in category A.

You issue the following SQL statement:

SELECT AVG(CASE WHEN promo_cost BETWEEN 0 AND 2000 AND promo_category='A' then promo_cost ELSE null END) "CAT_2000A",

AVG(CASE WHEN promo_cost BETWEEN 2001 AND 5000 AND promo_category='A' THEN promo_cost ELSE null END) "CAT_5000A"

FROM promotions;

What would be the outcome?

A. It executes successfully and gives the required result.

B. It generates an error because NULL cannot be specified as a return value.

C. It generates an error because CASE cannot be used with group functions.

D. It generates an error because multiple conditions cannot be specified for the WHEN clause.

答案：（A）

ITPub博客

OCP 1Z0-051-99

最新文章