10. View the Exhibit; e xamine the structure of the PROMOTIONS table.
Each promotion has a duration of at least seven days .
Your manager has asked you to generate a report, which provides the weekly cost for each promotion
done to l date.
Which query would achieve the required result?
A. SELECT promo_name, promo_cost/promo_end_date-promo_begin_date/7
FROM promotions;
B. SELECT promo_name,(promo_cost/promo_end_date-promo_begin_date)/7
FROM promotions;
C. SELECT promo_name, promo_cost/(promo_end_date-promo_begin_date/7)
FROM promotions;
D. SELECT promo_name, promo_cost/((promo_end_date-promo_begin_date)/7)
FROM promotions;
Answer: D
答案解析：
提要要求:报表提供促销期间每周的成本
D,正确，符合题意。
AB C语法错误
sh@TEST0924> SELECT promo_name, promo_cost/promo_end_date-promo_begin_date/7 FROM promotions;
SELECT promo_name, promo_cost/promo_end_date-promo_begin_date/7 FROM promotions
*
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected NUMBER got DATE
sh@TEST0924> SELECT promo_name,(promo_cost/promo_end_date-promo_begin_date)/7 FROM promotions;
SELECT promo_name,(promo_cost/promo_end_date-promo_begin_date)/7 FROM promotions
*
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected NUMBER got DATE
sh@TEST0924> SELECT promo_name, promo_cost/(promo_end_date-promo_begin_date/7) FROM promotions;
SELECT promo_name, promo_cost/(promo_end_date-promo_begin_date/7) FROM promotions
*
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected NUMBER got DATE