Evaluate the following ALTER TABLE statement:
ALTER TABLE orders
SET UNUSED (order_date);
Which statement is true?
A.
After executing the ALTER TABLE command, 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 ORDERS table.
D.
The DESCRIBE command would still display the ORDER_DATE column.