Oracle
1Z0-071 · Question #277
Which three are true about dropping columns from a table? (Choose three.)
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Managing Schema Objects
Question
Which three are true about dropping columns from a table? (Choose three.)
Options
- AA column drop is implicitly committed.
- BA column that is referenced by another column in any other table cannot be dropped.
- CA column can be removed only if it contains no data.
- DMultiple columns can be dropped simultaneously using the ALTER TABLE command.
- EA column must be set as unused before it is dropped from a table.
- FA primary key column cannot be dropped.
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Topics
#ALTER TABLE#drop column#primary key#constraints