oracle ocp 19c考题,科目082考试题(20)-set unused column

2022/1/25 19:07:09

本文主要是介绍oracle ocp 19c考题,科目082考试题(20)-set unused column,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

20、choose two:

Examine the structure of the DEPARTMENTS table

Name Null? Type

------------------------

DEPARTMENT NOT NULL NUMBER(4)

DEPARTMENT_NAME NOT NULL VARCHAR2(30)

MANAGER_ID NUMBER(6)

LOCATION_ID NUMBER(4)

COUNTRY VARCHAR2(20)

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.

source : cuug



这篇关于oracle ocp 19c考题,科目082考试题(20)-set unused column的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!


扫一扫关注最新编程教程