SQL 先进先出积分

Question

开发人员和分析师。我在 SQL 方面有一些经验，并且求助于类似的帖子。但是，这有点小众。预先感谢您的帮助。

我有以下数据集（已编辑。抱歉）

Setup

CREATE TABLE CustomerPoints
(
    CustomerID INT,
    [Date]     Date,
    Points     INT
)

INSERT INTO CustomerPoints
VALUES
    (1, '20150101', 500),
    (1, '20150201', -400),
    (1, '20151101', 300),
    (1, '20151201', -400)

需要转成（已编辑。之前table中的数字不正确）

积分为正数为积分，积分为负数为兑换积分。由于 FIFO（先进先出概念），在第二批花费的点数 (-400) 中，100 点来自 20150101（英国格式）获得的点数，300 点来自 20151101。

目标是为每个客户计算在赚取收入后的 x 和 y 个月内花费的积分数。再次感谢您的帮助。

Answer 1

我已经回答过类似的问题here and

您需要将单个单元获得和兑换的点数分解，然后将它们耦合，这样每个获得的点数都会匹配一个兑换点数。

对于这些匹配行中的每一行，计算从赚取到赎回所经过的月份，然后将其全部汇总。

对于 FN_NUMBERS(n) 它是一个计数 table，看看我在上面链接的其他答案。

;with
p as (select * from CustomerPoints),
e as (select * from p where points>0),
r as (select * from p where points<0),
ex as (
    select *, ROW_NUMBER() over (partition by CustomerID order by [date] ) rn
    from e
    join FN_NUMBERS(1000) on N<= e.points
),
rx as (
    select *, ROW_NUMBER() over (partition by CustomerID order by [date] ) rn
    from r
    join FN_NUMBERS(1000) on N<= -r.points
),
j as (
select ex.CustomerID, DATEDIFF(month,ex.date, rx.date) mm
from ex
join rx on ex.CustomerID = rx.CustomerID and ex.rn = rx.rn and rx.date>ex.date
)
-- use this select to see points redeemed in current and past semester
select * from j  join (select 0 s union all select 1 s ) p on j.mm >= (p.s*6)+(p.s) and j.mm < p.s*6+6 pivot (count(mm) for s in ([0],[2])) p order by 1, 2

-- use this select to see points redeemed with months detail
--select * from j pivot (count(mm) for mm in ([0],[1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12])) p order by 1

-- use this select to see points redeemed in rows per month
--select CustomerID, mm, COUNT(mm) PointsRedeemed   from j  group by CustomerID, mm order by 1

默认查询输出，0为0-6个月，1为7-12（赎回年龄）

CustomerID  0   1
1           700 100

第二次查询的输出，0..12是赎回年龄

CustomerID  0   1   2   3   4   5   6   7   8   9   10  11  12
1           0   700 0   0   0   0   0   0   0   0   0   100 0

第三个查询的输出，是以月为单位的赎回年龄

CustomerID  mm  PointsRedeemed
1           1   700
1           11  100

再见

SQL 先进先出积分

SQL First In First Out Loyalty Point

sql

sql-server

fifo