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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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出自：Oracle认证

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