Oracle
1Z0-071 · Question #42
Which three statements are true about the ALTER TABLE ----DROP COLUMN .....command?
The correct answer is B. A column can be dropped only if another column exists in the table. D. The column in a composite PRIMARY KEY with the CASCADE option can be dropped. E. A parent key column in the table cannot be dropped. See the full explanation below for the reasoning.
Question
Which three statements are true about the ALTER TABLE ----DROP COLUMN .....command?
Options
- AA column can be dropped only if it does not contain any data.
- BA column can be dropped only if another column exists in the table.
- CA dropped column can be rolled back.
- DThe column in a composite PRIMARY KEY with the CASCADE option can be dropped.
- EA parent key column in the table cannot be dropped.
How the community answered
(29 responses)- A7% (2)
- B83% (24)
- C10% (3)
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