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【071考试题库】OCP-1Z0-071最新考试题库大全-第57题

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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57题、choose two:

Examine the structure of the DEPARTMENTS table

You execute the following command:

SQL> ALTER TABLE departments

SET UNUSED (country);

Which two statements are true?

A) A new column, COUNTRY, can be added to the DEPARTMENTS table after executing the command.

B) Indexes created on the COUNTRY column exist until the DROP UNUSED COLUMNS command is executed.

C) Unique key constraints defined on the COUNTRY column are removed.

D) Synonyms existing on the DEPARTMENTS table would have to be re-created.

E) Views created on the DEPARTMENTS table that include the COUNTRY column are automatically

modified and remain valid.

Answer：AC

(注意：列一旦被设置为 unused 以后，基于该列的约束、索引都被删除，同时相关的视图

被无法访问。经过实验，可以马上往该表添加名字一样的列，有关 set unsed 的知识点考题

前面也有出现过，本题一个特点就是答案 A)

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