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/*mysqlÊý¾Ý¿âÖбíµÄÄÚÈÝ
mysql> select * from maindb;
+------------------+---------+-------------+---------+----------+---------------------+---------------------+---------------------+--------------------+
| id               | leixing | wenjianming | zhanhao | zhanming | scsj                | clsj                | sxsj                | baowen             |
+------------------+---------+-------------+---------+----------+---------------------+---------------------+---------------------+--------------------+
| 0000000000003215 | sp      | sp321654    |      12 | fuzhou   | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | oiyhjkghjdgfskdjfh |
| 0000000000003216 | NULL    | pet.txt     |     256 | ¸£ÖÝ            | 1970-01-01 08:04:16 | NULL                | 1970-01-01 08:09:08 |$
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