（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
正确答案
答案解析
略
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