0404250020017 002 无名氏        .01 2004-04-25 12:53:14.793000000 2002 0 0
0406200020006 002 无名氏        .01 2004-06-20 13:02:16.577000000 2002 0 0
0408010020021 002 无名氏        .01 2004-08-01 11:45:50.620000000 2002 0 0
0408020020023 002 无名氏        .10 2004-08-02 12:02:37.020000000 2002 0 0
0408050020023 002 无名氏        .01 2004-08-05 13:29:21.717000000 2002 0 0
0408200020020 002 无名氏        .01 2004-08-20 12:28:54.700000000 2002 0 0
0408210020010 002 无名氏        .01 2004-08-21 13:31:14.087000000 2002 0 0
0408240020012 002 无名氏        .01 2004-08-24 11:28:00.403000000 2002 0 0
0409010020018 002 无名氏        .01 2004-09-01 11:43:07.730000000 2002 0 0
0409010020023 002 无名氏        .01 2004-09-01 13:01:25.137000000 2002 0 0
0409080020004 002 无名氏        .01 2004-09-08 12:13:14.817000000 2002 我想删除第一列的记录中第四位数字为8的记录,请问应该怎样写条件语句