SELECT decode(level, '1','') ||biz_name biz_name,  biz_code,
   '' dis_name, '' dis_code, '' inv_name, '' inv_id ,level, nvl(up_cd,biz_code) 
FROM biz_tb a
where upper(deleted)='N' 
union
select a.biz_name biz_name, a.biz_code biz_code, b.dis_name dis_name, b.dis_code dis_code,
'' inv_name, '' inv_id ,level, nvl(up_cd, a.biz_code)
from biz_tb a, dis_tb b
where (a.biz_code = b.biz_code(+)) and upper(a.deleted)='N' and upper(b.deleted)='N'
union
select a.biz_name biz_name, a.biz_code biz_code, b.dis_name dis_name,
b.dis_code dis_code, c.inv_name inv_name, c.inv_id inv_id ,level, nvl(up_cd, a.biz_code)
from biz_tb a, dis_tb b ,inv_tb c
where upper(c.deleted)='N' and (a.biz_code = b.biz_code(+) and b.dis_code = c.dis_code(+))
connect by prior a.biz_code=a.up_loc_cd start with up_cd is null order by 8,7,2,1

위와 같이 쿼리하는데..

제목과 같은 에러가 발생합니다.

어느 부분이 도대체 잘못된건가요?

ㅠ.ㅠ