Question

我有一个数据集，按成员，按月，按产品记录收入。我可以按成员总结收入：

select sum(revenue), member, month from member_revenue group by member, month

我想计算按月更改的月份是按成员收入，理想情况下无需再次调用表格中的数据。

Answer 1

您可以使用已有的查询作为内部查询，并使用外部查询将其包装，该查询使用lag窗口函数减去每个月的上个月收入：

SELECT member, 
       month, 
       month_revenue,
       month_revenue - 
       LAG(month_revenue) OVER (PARTITION BY member
                                ORDER BY month ASC) AS revenue_change
FROM   (SELECT   member, month, SUM(revenue) AS month_revenue
        FROM     member_revenue
        GROUP BY member, month) t

Answer 2

只需使用lag()：

select member, month, sum(revenue) as this_month_revenue,
       lag(sum(revenue)) over (partition by member order by month) as last_month_revenue
from member_revenue
group by member, month;

注意：这假定所有月份都有收入。 LAG()获得前一行的收入，即使它不是前一个月。

计算Oracle SQL中的月度更改

2 个答案: