sum over partition by 的用法: https://blog.youkuaiyun.com/zhuiqiuuuu/article/details/79088709
count(*) over(partition by…的用法记录:https://blog.youkuaiyun.com/sinat_19671783/article/details/73925833
sum over partition by 的用法: https://blog.youkuaiyun.com/zhuiqiuuuu/article/details/79088709
count(*) over(partition by…的用法记录:https://blog.youkuaiyun.com/sinat_19671783/article/details/73925833