我在MUL中有KEY的列，我需要取消设置。
如何在mysql命令行中取消设置KEY MUL？
+-----------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+-------------------+-----------------------------+
| uf_imob | varchar(51) | NO | MUL | NULL | |
+-----------------+--------------+------+-----+-------------------+-----------------------------+