写卸载插件操作数据库的表报错，而直接运行不会保错

ALTER TABLE pre_common_member DROP COLUMN dcheck;
ALTER TABLE pre_common_member DROP COLUMN dataqq;
ALTER TABLE pre_common_member DROP COLUMN dataem;
ALTER TABLE pre_common_member DROP COLUMN checkqq;
ALTER TABLE pre_common_member DROP COLUMN unqq;

什么问题？还是不能操作 pre_common_member