您可以在计算 周围 和窗口 内 使用case
表达式: sum
select
sales_date,
country,
sum(sales_volume),
case when country <> 'NL'
then sum(sum(fix_costs)) over(partition by year(sales_date), month(sales_date))
/ day(last_day(sales_date))
* sum(sales_volume)
/ sum(case when country <> 'NL' then sum(sales_volume) else 0 end) over(partition by sales_date)
else 0
end as fix_cost_per_day
from sales
group by 1,2;
:
销售日期| 国家| 总和(sales_volume)| fix_cost_per_day
:--------- | :------ | ----------------:| ---------------:
2020-01-03 | DE | 500 | 37.95066414
2020-01-03 | FR | 350 | 26.56546490
2020-01-03 | NL | 320 | _空_
2020年1月30日| 无| 0 | _空值_
2020-02-15 | DE | 700 | 137.14733542
2020-02-15 | FR | 180 | 35.26645768
2020-02-15 | NL | 420 | _null_
2020-02-29 | 无| 0 | _空值_
2020-03-27 | DE | 180 | 20.19635344
2020-03-27 | FR | 970 | 108.83590463
2020-03-27 | NL | 670 | _null_
2020-03-31 | 无| 0 | _空值_