OCP认证是Oracle非常重要的一个认证,对于11g版本来说,考试科目为071、052、053,对于12c版本来说,考试科目为071、062、063,可见071是个很重要的考试,这里我们收集了近期071考试的原题,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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