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17.choose the best answer
View the Exhibit and examine the description of the EMPLOYEES table.
Evaluate the following SQL statement:
SELECT first_name, employee_id, NEXT_DAY(ADD_MONTHS(hire_date,6),1) "Review" FROM employees;
The query was written to retrieve the FIRST_NAME, EMPLOYEE_ID, and review date for employees. The review date is the first Monday after the completion of six months
of the hiring.
The NLS_TERRITORY parameter is set to AMERICA in the session.
Which statement is true regarding this query?
A) The query would not execute because the NEXT_DAY function accepts a string as argument.
B) The query would execute to give the desired output.
C) The query would not execute because date functions cannot be nested.
D) The query would execute but the output would give review dates that are Sundays.
Answer：D
(解析：题目的意思是显示某个时间以后第一个周一的日期，但是西方人的第一天是星期天，
所以应该修改为 NEXT_DAY(ADD_MONTHS(hire_date,6),2)
步骤：
SQL> alter session set NLS_TERRITORY=america;
SQL> select next_day(sysdate,2) from dual;
NEXT_DAY(SYSDA
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03-12 月-18 #这一天是周日
SQL> select next_day(sysdate,1) from dual;
NEXT_DAY(SYSDA
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02-12 月-18 #这一天是周一
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