0、select * from wmg_test; —测试数据 1、select v1,v2,sum(v2) over(order by v2) as sum from wmg_test; –按照 v2排序，累计n+n-1+…+1 2、select v1,v2,sum(v2) over(partition by v1 order by v2) as sum from wmg_test; --先分组，组内在进行 1 中的操作 3、select v1,v2,sum(v2) over(partition by v1 order by v1) as sum from wmg_test; —稳定排序 4、select v1,v2,sum(v2) over(partition by v1) as sum from wmg_test; --相同key的进行回填处理，没有order by 5、select distinct v1,sum_01 from (select v1,sum(v2) over(partition by v1) as sum_01 from wmg_test) a; 6、当然也可以逆序累加，只需order by desc 即可 总结区别：group by 和partition by的区别 group 单纯分组 partition 也能分组，但还具备累计的功能 7、max … partition by 通sum … partition by ，从第一条到当前的最大值 Select Pty_Id, Data_Dt,Fin_In, Max(Fin_In) Over(Partition By Pty_Id Order By Data_Dt) As Max_Cost from