如何为每位员工汇总5年内6个月范围内的数据？

如何解决如何为每位员工汇总5年内6个月范围内的数据？

我是SQL编程的新手，需要您的帮助。 我需要编写一个sql查询，该查询对从加入公司之日起每位员工每6个月的金额和5年之前的累计年数进行累加。

我的表格如下所示

Employee    StartDate   DealDate    Amount
1           10/01/2017  11/01/2017  10000    --Starting month
1           10/01/2017  11/02/2017  15000    --within first 6 month of joining
1           10/01/2017  11/07/2017  20000    --6-12 months
1           10/01/2017  11/01/2018  30000    --12-18 months
1           10/01/2017  11/02/2018  40000    --12-18 months
1           10/01/2017  11/07/2018  50000    --18-24 months
1           10/01/2017  11/01/2019  60000    --24-30 months
1           10/01/2017  11/08/2019  70000    --30-36 months
1           10/01/2017  11/01/2020  80000    --36-42 months
1           10/01/2017  11/07/2020  90000    --42-48 months
2           20/01/2017  11/01/2017  10000    --so on for employee 2
2           20/01/2017  11/02/2017  25000
2           20/01/2017  11/07/2017  40000
2           20/01/2017  11/01/2018  30000
2           20/01/2017  11/02/2018  40000
2           20/01/2017  11/07/2018  50000
2           20/01/2017  11/01/2019  60000
2           20/01/2017  11/08/2019  70000
2           20/01/2017  11/01/2020  80000

and my expected outcome is

Employee    StartDate   [0-6month]  [6-12month] [1 year]    [12-18 month]   [18-24 month]   [2 year]
1           10/01/2017  25000       20000       45000       70000           50000           165000
2           20/01/2017  35000       40000       75000       70000           50000           195000

我尝试了以下

DECLARE @range1start DATE = @date
DECLARE @range1end DATE = (SELECT DATEADD(m,6,@range1start))
DECLARE @range2start DATE = @range1end
DECLARE @range2end DATE = (SELECT DATEADD(m,@range2start))
DECLARE @range3start DATE = @range2end
DECLARE @range3end DATE = (SELECT DATEADD(m,12,@range3start)) '

，然后对每个范围使用大小写条件。我想知道是否有一种更好的方法可以在不使用太多变量和循环的情况下实现这一目标。任何帮助表示赞赏。

谢谢！

解决方法

您可以使用条件聚合-尽管键入时有点冗长：

select
    employee,minstartdate startdate,sum(case when dealdate < dateadd(month,6,startdate) then amount end) [0-6 month],sum(case when dealdate >= dateadd(month,startdate) and dealdate < dateadd(month,12,startdate) then amount end) [6-12 month],startdate) then amount end) [1 year],18,startdate) then amount end) [12-18 month],24,startdate) then amount end) [18-24 month],startdate) then amount end) [2 year]
from mytable
group by employee