cume_dist()，允许并列名次复制名次自动空缺，取并列后较大名次，结果如22355778……
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将score按ID分组排名：cume_dist() over(partition by id order by score desc)*sum(1) over(partition by id)
将score不分组排名：cume_dist() over(order by score desc)*sum(1) over()
select id,area,score,
sum(1) over() as 总数,
sum(1) over(partition by id) as 分组个数,
(cume_dist() over(partition by id order by score desc))*(sum(1) over(partition by id)) 分组id排序,
(cume_dist() over(order by score desc))*(sum(1) over()) 不分组排序
from students order by id,area
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