这两年来,OCP的071考试不像以前那么稳定了,总是不断的有新考题出现,增加了071考试的难度,对此,我们对071考试的原题进行了收集,并由专业人员给出了答案,分享给大家。
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6. choose the best answer
In the EMPLOYEES table there are 1000 rows and employees are working in the company for more than 10 years.
Evaluate the following SQL statement:
SQL> UPDATE employees
SET salary = NVL(salary,0) + NVL(comm,0),comm = NVL(comm,0)
WHERE hire_date < SYSDATE - 600;
What would be the result?
A) It gives an error because NVL function cannot be used with UPDATE.
B) It gives an error because multiple NVL functions are used in an expression.
C) It executes successfully and updates the records of those employees who have been working in the company for more than 600 days.
D) It executes successfully but no rows updated.
Answer:C
(SQL> update emp
2 set sal=nvl(sal,0)+nvl(comm,0),comm=nvl(comm,0)
3 where hiredate < sysdate - 100;
已更新 14 行。
)
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