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Oracle OCP 19c 认证1Z0-082考试题库(第22题)-CUUG整理

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发表于 2022-2-26 17:00:01 | 显示全部楼层 |阅读模式
22、Choose three
Which three are true about dropping columns from a table?
A) A column can be removed only if it contains no data.
B) A column drop is implidtly committed
C) A column that is referenced by another column in any other table cannot be dropped.
D) A column must be set as unused before it is dropped from a table.
E A primary key column cannot be dropped.
F) Multiple columns can be dropped simultaneously using the ALTER TABLE command.

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