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2018年的时候,OCP 11g考试题库大更新,052 053出现了很多新题,
2019年,11g即将停考的前期,Oracle又出现了一次大变动,12c出现了很多新题,比如062 063题库大更新
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QUESTION 34
Examine the following command:
CREATE TABLE (prod_id number(4),
Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE);
Which three statements are true about using an invisible column in t he PRODUCTS table?
A. The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.
B. The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.
C. Referential integrity constraint cannot be set on t he invisible column.
D. The invisible column cannot be made visible and can only be marked as unused.
E. A primary key constraint can be added on t he invisible column.
Correct Answer: ABE
(解析:一般来说,看不见列帮助迁移和发展在线应用程序。一个用例可能是一个应用程序,该应用程序可以查询一个三列的表SELECT *声明。第四列添加到表会破坏应用程序,预计三列的数据。添加第四个无形的列使应用程序正常运转。开发人员可以改变应用程序来处理第四列,并使列可见当应用程序上线。)