Which statement is true?

Evaluate the following ALTER TABLE statement: ALTER TABLE orders SET UNUSED
order_date; Which statement is true?

Evaluate the following ALTER TABLE statement: ALTER TABLE orders SET UNUSED
order_date; Which statement is true?

A.
The ORDER_DATE column should be empty for the ALTER TABLE command to
execute successfully.

B.
After executing the ALTER TABLE command, you can add a new column called
ORDER_DATE to the ORDERS table.

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.

Explanation:



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