Oracle OCP 19c 认证1Z0-082考试题库(第20题)-CUUG内部学员版082题库解析
Examine the structure of the DEPARTMENTS table
Name Null? Type
DEPARTMENT NOT NULL NUMBER(4)
DEPARTMENT_NAME NOT NULL VARCHAR2(30)
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.