Oracle Database SQL 12c 1z0-071 Exam Practice Test 3

Question : 43 of 50

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Which two are true about dropping columns from a table? (Choose two.)

A column drop is implicitly committed.
A column that is referenced by another column in any other table cannot be dropped.
A column can be removed only if it contains no data.
Multiple columns can be dropped simultaneously using the ALTER TABLE command.
A column must be set as unused before it is dropped from a table.
A primary key column cannot be dropped.

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