Oracle
1Z0-071 · Question #419
1Z0-071 Question #419: Real Exam Question with Answer & Explanation
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Question
Which two are true about unused columns? (Choose two.)
Options
- AA query can return data from unused columns, but no DML is possible on those columns.
- BUnused columns retain their data until they are dropped.
- COnce a column has been set to unused, a new column with the same name can be added to the
- DThe DESCRIBE command displays unused columns.
- EA primary key column cannot be set to unused.
- FA foreign key column cannot be set to unused.
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