SQL执行错误【ID：1030，错误信息是：Got error 28 from storage engine, SELECT ext.id,ext.identifier,ext.form_type,extc.content,ext.ext,ext.ftype FROM kd_fields ext JOIN kd_extc extc ON(ext.id=extc.id)  WHERE ext.ftype='list-2421' ORDER BY ext.taxis ASC,ext.id DESC】