Impala SQL中的分区引发错误

Question

我正在尝试使用 TOAD 计算 Impala 上几个月的总损失

以下查询抛出错误 -选择列表表达式不是由聚合输出生成的（从 group by 子句中丢失）

select
segment,
year(open_dt) as open_year,
months,
sum(balance)
sum(loss) over (PARTITION by segment,year(open_dt) order by months) as NCL 
from

tableperf
where
year(open_dt) between 2015 and 2018

group by 1,2,3

Answer 1

您正在混合聚合和窗口函数。我想你可能想要：

select segment, year(open_dt) as open_year, months,
       sum(balance)
       sum(sum(loss)) over (PARTITION by segment, year(open_dt) order by months) as NCL 
from tableperf
where year(open_dt) between 2015 and 2018
group by 1, 2, 3;

这会计算每年的累计损失。注意sum(sum(loss)) 的使用。内部sum() 是一个聚合函数。外层sum()是一个窗口函数。