1z0-071 Exam Dumps | Which two are true about unused columns?

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Question 61/139

Which two are true about unused columns?

A. The DESCRIBE command displays unused columns

B. A primary key column cannot be set to unused.

C. A query can return data from unused columns, but no DML is possible on those columns.

D. Once a column has been set to unused, a new column with the same name can be added to the table.

E. A foreign key column cannot be set to unused.

F. Unused columns retain their data until they are dropped

Correct Answer: D,F

Unused columns are a feature in Oracle that allows a column to be marked as unused without immediately dropping it from the table structure. The key points for each option are:
A: The DESCRIBE command does not display unused columns. These columns are also not visible in user_tab_cols but are visible in user_unused_col_tabs.
B: Primary key columns can be set to unused, but you must drop the primary key constraint before doing so.
C: Once a column is marked as unused, it is not possible to query it, and Oracle will not allow DML operations on that column.
D: This is true. Once a column is set to unused, you can add a new column with the same name because Oracle essentially considers the unused column as removed from the table.
E: Just like primary key columns, a foreign key column can be marked as unused, but you must drop the foreign key constraint first.
F: This is true. Unused columns retain their data until the column is dropped using the DROP UNUSED COLUMNS command.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"
* Oracle Database Administrator's Guide, 12c Release 1 (12.1)

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