SQL优先领先忠诚点

时间:2016-10-13 14:09:18

标签: sql sql-server fifo

其他开发人员和分析师。我有一些SQL经验,并使用类似的帖子。然而,这是一个更小的利基。提前感谢您的帮助。

我有以下数据集(编辑。道歉)

Data Set

  

设置

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)

并需要将其变为(已编辑。上表中的数字不正确) enter image description here

任何积分的积分都是积分,而积极积分则是兑换积分。由于FIFO(第一个概念中的第一个),在第二批花费的点数(-400)中,其中100个是从20150101(英国格式)获得的点数和从20151101获得的300点。

目标是为每位客户计算在x和y个月的收入中花费的点数。再次,谢谢你的帮助。

1 个答案:

答案 0 :(得分:4)

我已经回答了类似问题herehere

你需要爆炸单个单位赚取和兑换的积分,然后将它们结合起来,这样每个获得的积分将与兑换积分相匹配。

对于这些匹配行中的每一行,计算从赚取到兑换所经过的月份,然后将其汇总。

对于FN_NUMBERS(n),它是一个计数表,请查看我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(以月为单位的兑换年龄)

CustomerID  0   1
1           700 100

第二个查询的输出,0..12是以月为单位的兑换年龄

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

第三次查询的输出,是以月为单位的兑换年龄

CustomerID  mm  PointsRedeemed
1           1   700
1           11  100

再见