Which two are true about unused columns? (Choose two.)

Question

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.

• A
  3% (1)
• B
  75% (24)
• C
  6% (2)
• F
  16% (5)

Explanation

https://decipherinfosys.wordpress.com/2007/11/15/back-to-the-basics-dropping-unused-columns-

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