Oracle OCP 19c 认证1Z0-082考试题库(第18题)CUUG整理

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Oracle OCP 19c 认证1Z0-082考试题库(第18题)-CUUG内部学员版082题库解析

18、Evaluate the following ALTER TABLEstatement:

ALTER TABLE orders SET UNUSED (order_date);

Which statement is true?

A. After executing the ALTER TABLEcommand, you can add a new column called ORDER_DATE to the ORDERS table.

B. The ORDER_DATE column should be empty for the ALTER TABLE command to execute succsessfully.

C. ROLLBACK can be used to get back the ORDER_DATE column in the ORDERStable.

D. The DESCRIBE command would still display the ORDER_DATE column.