쿼리만으로는 해결을 보지 못했고....

일단, java 단에서 처리 했습니다. ㅜㅜ

이렇게 하면 안될까요..

SELECT * FROM 테이블

 ORDER BY MIN(시작시간) OVER(PARTITION BY 팀 ORDER BY 시작시간, 우선순위)

with t(seq, pt, st, et, wt, pri, team) as (
select 1, 6, 6, 7, 1, 1, 't1' from dual union all
select 2, 7, 7, 8, 2, 2, 't1' from dual union all
select 3, 10, 10, 11, 1, 3, 't1' from dual union all
select 4, 7, 7, 9, 2, 4, 't1'  from dual union all
select 5, 16, 16, 18, 2, 5, 't1'  from dual union all
select 6, 6, 6, 8, 2, 1, 't2'  from dual union all
select 7, 6, 6, 8, 2, 2, 't2'  from dual union all
select 8, 9, 9, 10, 1, 4, 't2'  from dual union all
select 9, 14, 14, 17, 3, 5, 't2'  from dual union all
select 10, 7, 7, 8, 1, 3, 't2' from dual
)
select seq, pt,
       st_first + lag(wt_sum,1,0) over (partition by team order by wt_sum) st,
       st_first + lag(wt_sum,1,0) over (partition by team order by wt_sum) + wt et,
       wt, pri, team
  from 
      (select team, seq, pt, st, wt, pri,
              min(decode(pri,1,st)) over (partition by team order by pri) st_first,
              sum(wt) over (partition by team order by team, pt, pri) wt_sum
         from t
        order by team, pt, pri)