代碼：

from t1,t2 自連接 兩兩組合

group by + having 求和 選出<=1000的項

# Write your MySQL query statement below
select a.person_name
from Queue a, Queue b
where a.turn>=b.turn
group by a.person_id 
having sum(b.weight)<=1000
order by a.turn desc
limit 1