Oracle OCP 19c ÈÏÖ¤1Z0-082¿¼ÊÔÌâ¿â(µÚ18Ìâ)-CUUGÄÚ²¿Ñ§Ô±°æ082Ìâ¿â½âÎö

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.