| 1. |
What is the main difference between the SET UNUSED COLUMN and the DROP COLUMN clauses of the ALTER TABLE command?
Please select the best answer.
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A. |
You can view the data in the unused column and you cannot view the data in a dropped column.
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B. |
You free up space with DROP COLUMN (but not with SET UNUSED COLUMN).
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C. |
You can use SET UNUSED COLUMN (but not DROP COLUMN) on a primary key column.
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D. |
You can specify a list of columns with SET UNUSED COLUMN (but not with DROP COLUMN).
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