OCP19C-82

ALTER TABLE orders SET UNUSED (order_date); Which statement is true?

发布于 2021-04-25 04:04:31

【多选题】
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.

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LM1998 2023-04-25

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