这个命令没有返回任何输出，这就表明磁盘的确是空的。

The command did not return any output, confirming that the disks were indeed empty.

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通过在CREATE TABLE命令中指定LIKE选项，创建一个与现有表结构相同的空表(清单4)。

Creating an empty table with the same structure as an existing table can be done by specifying the LIKE option of the CREATE table command (Listing 4).

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对于任务命令，在调用execute方法之前设置空的命令结果。

For task commands, an empty command result is set before invoking the execute method.

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