第四篇文章一场pandas与SQL的巅峰大战（四）学习了在MySQL，Hive SQL和pandas中用多种方式计算日环比，周同比的方法。...本篇文章一起来探讨如何在SQL和pandas中计算累计百分比。仍然分别在MySQL，Hive SQL和pandas中用多种方案来实现。...>= b.dt
group by a.id, a.dt, a.orderamt
) c
left join
(
select sum(orderamt) as total
from t_orderamt...求每月总计金额的代码比较简单：
select substr(a.dt, 1, 7) as mon, sum(orderamt) as total
from t_orderamt a
group by substr..., 1, 7) as mon, sum(orderamt) as total
from t_orderamt a
group by substr(a.dt, 1, 7)
) d on c.mon = d.mon
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