【071考试题库】OCP-1Z0-071最新考试题库大全-第35题
Oracle 12c的OCP考试考3科，分别是071、062、063，对于这些考题，我们专门有人负责收集整理，并由专业的老师对这些考题进行解析，希望可以帮助想考OCP的同学，这里开始介绍071的题库。
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071考试题库-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)
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