RUNCMD和EDIT都允许指定命令序号来标识要编辑或运行的缓存命令。

Both RUNCMD and edit let you specify a command sequence number to identify the cached command that you want to edit or run.

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如果不指定序号，那么系统会检索最近运行的命令。

If you do not specify a sequence number, the system retrieves the most recently run command.

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我们将调用EDIT命令，并在顺序中指定语句序号2，通过这些操作给上面的select语句添加where子句。

Let's add a WHERE clause to that SELECT statement by invoking the EDIT command and specifying statement number 2 in the sequence.

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