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【071考试】最新OCP认证071考试题库整理-第39题

【071考试】最新OCP认证071考试题库整理-第39题

来源:CUUG培训-优技培训    更新时间:2019/5/27 14:01:19    阅读次数:

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

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071考试-第39题、choose two

Which two statements are true regarding views? (Choose two.)

A) A simple view in which column aliases have been used cannot be updated.

B) The OR REPLACE option is used to change the definition of an existing view without dropping and re-creating it.

C) The WITH CHECK OPTION constraint can be used in a view definition to restrict the columns displayed through the view.

D) Rows added through a view are deleted from the table automatically when the view is dropped.

E) Rows cannot be deleted through a view if the view definition contains the DISTINCT keyword.

F) A subquery used in a complex view definition cannot contain group functions or joins.

Answer:BE

(解析:

只要是简单视图,使用别名的列是可以使用 UPDATE 命令更新的。

WITH CHECK OPTION 用于限制通过视图更改基表的条件,禁止更改不包含在子查询条件里的行。)

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