多选题Which three descriptions are correct about the effects of the TRUNCATE command on a table（）AThe corresponding indexes for the table are also truncated.BDelete triggers on the table are fired during the execution of the TRUNCATE command.CThe child table is truncated when the TRUNCATE command is applied on the parent table.DThe high-water mark （HWM） is set to point to the first usable data block in the table segment.ENo undo or very little undo data is generated during the execution of the TRUNCATE command
多选题
Which three descriptions are correct about the effects of the TRUNCATE command on a table（）
A
The corresponding indexes for the table are also truncated.
B
Delete triggers on the table are fired during the execution of the TRUNCATE command.
C
The child table is truncated when the TRUNCATE command is applied on the parent table.
D
The high-water mark （HWM） is set to point to the first usable data block in the table segment.
E
No undo or very little undo data is generated during the execution of the TRUNCATE command
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