报ORA-00918:column ambiguously defined错误

select *
  from (select a.*,rownum rn 
          from (select t.vrid,
                       t.province,
                       t.customer,
                       t.cartypecode,
                       t.engine,
                       t.carnumber,
                       t.gboscode,
                       t.v3gvideocode,
                       
                       t.enginenumber,
                       t.vincode,
                       
                       t.platenumber,
                       
                       t.sensorcharcoefficient,
                       t.factk,
                       
                       t.theoryk,
                       t.tireradius,
                       t.backbridgespeed,
                       t.softmathk,
                       t.kissueddate,
                       t.installdate,
                       t.equmentchange,
                       t.installplace,
                       t.getinfodate,
                       t.salesman,
                       t.isoperationcar,
                       t.iscoverplace,
                       t.isbuttjoint,
                       t.operatesituation,
                       t.platenumber,
                       t.inforimportdate,
                       t.customertype,
                       t.iscanbuttjoint,
                       t.re
                  from t_o_dayvehicle t ) a
         where rownum <= 15)
 where rn > 0来个老问题。报ORA-00918:column ambiguously defined 
知道列重复，可是我就这一张表查询阿，怎么会报错呢？我把 t.platenumber,随便写一个 t.platenumber as gh就可以了。但是是t.platenumber as platenumber就报这鸟错误阿。Shit!@