大数据就业实战培训 Oracle就业实战培训
071考试题库之前是比较稳定的，但随着Oracle的调整，071考试不断的增加新的考题，增加了考试的难度，所以我们专门收集整理了这些考试，并对这些考题进行解析，希望可以对考生有帮助。
每周五晚8点，我们有免费的OCP解析公开课，地址：https://ke.qq.com/course/326223 OCP题库交流群：1015267481，验证ocp
-------------------------------------------------------
071考试-第35题、choose the best answer:
View the Exhibit and examine the structure of the ORDERS table.
Which UPDATE statement is valid?
A) UPDATE orders
SET order_date = '12-mar-2007'
AND order_total = TO_NUMBER(NULL)
WHERE order_id = 2455;
B) UPDATE orders
SET order_date = '12-mar-2007',
order_total = NULL
WHERE order_id = 2455;
C) UPDATE orders
SET order_date = TO DATE('12-mar-2007','dd-mon-yyyy'),
SET order_total = TO NUMBER(NULL)
WHERE order_id = 2455;
D) UPDATE orders
SET order_date = '12-mar-2007',
order_total IS NULL
WHERE order_id = 2455;
Answer：D
(解析：注意语法)
