OCP认证12c题库CUUG 071题库考试原题及答案(25)
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了OCP认证12c题库CUUG 071题库考试原题及答案(25)相关的知识,希望对你有一定的参考价值。
- choose the best answer
Evaluate the following SQL statement:
ALTER TABLE hr.emp
SET UNUSED (mgr_id);
Which statement is true regarding the effect of the above SQL statement?
A) Any views created on the EMP table that include the MGR_ID column would be automatically modified and remain valid.
B) Any constraints defined on the MGR_ID column would be removed by the above command.
C) Any synonym existing on the EMP table would have to be re-created.
D) Any index created on the MGR in column would continue to exist until the DROP UNUSED COLUMNS command is executed.
Answer:B
(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。)
以上是关于OCP认证12c题库CUUG 071题库考试原题及答案(25)的主要内容,如果未能解决你的问题,请参考以下文章
OCP认证12c题库CUUG 071题库考试原题及答案(27)
OCP认证12c题库CUUG 071题库考试原题及答案(28)
OCP认证12c题库CUUG 071题库考试原题及答案(28)
OCP题库最新CUUG OCP 12c 071考试题库(65题)