我有一个如下数据集 - 按周和产品汇总的数量和销售额
Week Product Quantity Sales
---- ------- -------- -----
1 12a 6 600
2 12a 4 400
3 12a 3 300
4 12a 1 100
5 12a 3 300
6 12a 1 100
7 12a 4 400
8 12a 6 600
9 12a 2 200
对于每周,我需要将当周以及前 3 周的数量和销售额相加
期望的结果将是:
Week Product Quantity Sales
---- ------- -------- -----
1 12a 14 1400 --> Week 1 + Week 2 + Week 3 + Week 4 but row labeled Week 1
2 12a 11 1100
我觉得我每周都需要一个循环来评估
使用窗口函数:
select t.*,
sum(quantity) over (partition by product
order by week
rows between current row and 3 following
) as quantity,
sum(sales) over (partition by product
order by week
rows between current row and 3 following
) as sales
from t;