147.View the Exhibit and examine the structure of the PROMOTIONS table.

147.View the Exhibit and examine the structure of the PROMOTIONS table.
Evaluate the following SQL statement:


SQL>SELECT promo_name,CASE
WHEN promo_cost >=(SELECT AVG(promo_cost) FROM promotions WHERE promo_category='TV')
then 'HIGH' else 'LOW' END COST_REMARK FROM promotions;


Which statement is true regarding the outcome of the above query?
A.It shows COST_REMARK for all the promos in the table.
B.It produces an error because the subquery gives an error.
C.It shows COST_REMARK for all the promos in the promo category 'TV'.
D.It produces an error because subqueries cannot be used with the CASE expression.
答案：A