oracle 未明确定义错误

select sysuser1.*
from (select sysuser2.*, rownum rownum_temp
from (select yycgdmx.id yycgdmxid,
     --  yycgdmx.zbjg,
yycgdmx.jyjg,
yycgdmx.cgl,
yycgdmx.cgje,
yycgdmx.cgzt,
(select dictinfo.info
from dictinfo
where dictinfo.typecode = '011'
and dictinfo.dictcode = yycgdmx.cgzt) cgztmc,
useryy.mc useryymc,
useryy.id useryyid,
usergys.mc usergysmc,
usergys.id usergysid,
ypxx.id,
ypxx.bm,
ypxx.mc,
ypxx.jx,
ypxx.gg,
ypxx.zhxs,
ypxx.scqymc,
ypxx.spmc,
    --    ypxx. zbjg,
ypxx.jyzt,
(select info
from dictinfo
where ypxx.jyzt = dictcode
and typecode = '003') jyztmc
from yycgdmx2015 yycgdmx,
yycgd2015   yycgd,
ypxx,
useryy,
usergys
where yycgdmx.yycgdid = yycgd.id
and yycgd.useryyid = useryy.id
and yycgdmx.ypxxid = ypxx.id
and yycgdmx.usergysid = usergys.id
and yycgdmx.yycgdid = '2015100000') sysuser2
where rownum <= 20) sysuser1
where sysuser1.rownum_temp > 0

未明确定义列
sysuser2.*   *中 有 有列名重复
导致 不知道 外层 选哪一个列