客户可以在整个生命周期内处于多个职位，并且只能有一个有效职位（标记为开始日期和结束日期）。职位是成本中心的一部分。
如果客户终身有18个职位，我必须检查连续订单中的任何职位是否属于同一成本中心。如果他们是，那么我从最早的位置（相同的成本中心）使用开始日期。我写过这样的话：
答案 0 :(得分：1)
通过在稍微不同的分区上使用2 row_number（）计算，可以得到一个计算（rn），允许我们对同一成本中心中的每个连续位置组进行分组。设置临时表时，您已经有一个这样的row_number。我包括了rn1＆amp;你可以调查一下它是如何运作的。
MS SQL Server 2014架构设置：
CREATE TABLE TempTbl
([ConsecutivePositions] int, [CustomerID] int, [PositionID] int, [CustomerPositionId] int, [StartDate] datetime, [EndDate] varchar(23), [CostCentreID] int)
;
INSERT INTO TempTbl
([ConsecutivePositions], [CustomerID], [PositionID], [CustomerPositionId], [StartDate], [EndDate], [CostCentreID])
VALUES
(1, 2734, 195, 31860, '2013-10-17 16:08:53', '2015-03-06 11:51:09.440', 5),
(2, 2734, 29, 39405, '2015-03-06 11:51:09', '2016-01-27 13:10:19.720', 3),
(3, 2734, 271, 23599, '2012-04-05 16:21:41', '2012-12-04 11:32:47.433', 13),
(4, 2734, 107, 26479, '2012-12-04 11:32:47', '2013-03-19 09:07:13.633', 14),
(5, 2734, 297, 28497, '2013-03-19 09:07:13', '2013-10-17 16:08:53.120', 14),
(6, 2734, 154, 2723, '2007-11-27 00:00:00', '2009-07-10 15:44:16.640', 3),
(7, 2734, 145, 19436, '2011-03-15 00:00:00', '2011-10-18 15:42:36.877', 906),
(8, 2734, 146, 17453, '2010-09-12 00:00:00', '2010-11-11 15:58:25.043', 13),
(9, 2734, 8, 18180, '2010-11-11 00:00:00', '2011-03-15 17:57:48.027', 13),
(10, 2734, 8, 21606, '2011-10-18 15:42:36', '2011-11-11 16:42:54.787', 13),
(11, 2734, 8, 21982, '2011-11-14 11:18:24', '2012-04-05 16:21:41.230', 13),
(12, 2734, 264, 21958, '2011-11-11 16:42:54', '2011-11-14 11:18:24.057', 906),
(13, 2734, 5, 12785, '2009-07-10 00:00:00', '2009-07-29 09:30:52.430', 3),
(14, 2734, 5, 12999, '2009-07-29 00:00:00', '2010-03-04 13:00:30.223', 3),
(15, 2734, 149, 15165, '2010-03-04 00:00:00', '2010-08-16 12:13:30.703', 3),
(16, 2734, 8, 17044, '2010-08-16 00:00:00', '2010-09-12 16:29:01.203', 13),
(17, 2734, 891, 45453, '2016-01-27 13:10:19', NULL, 906)
;
查询1 ：
with cte as (
select
*
, row_number() over(partition by CustomerID order by StartDate) rn1
, row_number() over(partition by CustomerID, CostCentreID order by StartDate) rn2
, row_number() over(partition by CustomerID order by StartDate)
- row_number() over(partition by CustomerID, CostCentreID order by StartDate) rn3
from temptbl
)
select
CustomerID
, CostCentreID
, rn3
, count(*) c
, min(StartDate) StartDate
, max(EndDate) EndDate
from cte
group by
CustomerID, CostCentreID, rn3
order by
CustomerID, StartDate
<强> Results ：
| CustomerID | CostCentreID | rn3 | c | StartDate | EndDate |
|------------|--------------|-----|---|----------------------|-------------------------|
| 2734 | 3 | 0 | 4 | 2007-11-27T00:00:00Z | 2010-08-16 12:13:30.703 |
| 2734 | 13 | 4 | 3 | 2010-08-16T00:00:00Z | 2011-03-15 17:57:48.027 |
| 2734 | 906 | 7 | 1 | 2011-03-15T00:00:00Z | 2011-10-18 15:42:36.877 |
| 2734 | 13 | 5 | 1 | 2011-10-18T15:42:36Z | 2011-11-11 16:42:54.787 |
| 2734 | 906 | 8 | 1 | 2011-11-11T16:42:54Z | 2011-11-14 11:18:24.057 |
| 2734 | 13 | 6 | 2 | 2011-11-14T11:18:24Z | 2012-12-04 11:32:47.433 |
| 2734 | 14 | 12 | 2 | 2012-12-04T11:32:47Z | 2013-10-17 16:08:53.120 |
| 2734 | 5 | 14 | 1 | 2013-10-17T16:08:53Z | 2015-03-06 11:51:09.440 |
| 2734 | 3 | 11 | 1 | 2015-03-06T11:51:09Z | 2016-01-27 13:10:19.720 |
| 2734 | 906 | 14 | 1 | 2016-01-27T13:10:19Z | (null) |
使用更多窗口函数代替按查询分组，您可以获取临时表中的所有详细信息以及所需的成本中心相关日期。
with cte as (
select
*
, row_number() over(partition by CustomerID order by StartDate) rn1
, row_number() over(partition by CustomerID, CostCentreID order by StartDate) rn2
, row_number() over(partition by CustomerID order by StartDate)
- row_number() over(partition by CustomerID, CostCentreID order by StartDate) rn3
from temptbl
)
, cte2 as (
select
*
, min(StartDate) over(partition by CustomerID, CostCentreID, rn3) MinStartDate
, max(EndDate) over(partition by CustomerID, CostCentreID, rn3) MaxEndDate
from cte
)
select
*
from cte2
;
<强> Results ：
| ConsecutivePositions | CustomerID | PositionID | CustomerPositionId | StartDate | EndDate | CostCentreID | rn1 | rn2 | rn3 | MinStartDate | MaxEndDate |
|----------------------|------------|------------|--------------------|----------------------|-------------------------|--------------|-----|-----|-----|----------------------|-------------------------|
| 6 | 2734 | 154 | 2723 | 2007-11-27T00:00:00Z | 2009-07-10 15:44:16.640 | 3 | 1 | 1 | 0 | 2007-11-27T00:00:00Z | 2010-08-16 12:13:30.703 |
| 13 | 2734 | 5 | 12785 | 2009-07-10T00:00:00Z | 2009-07-29 09:30:52.430 | 3 | 2 | 2 | 0 | 2007-11-27T00:00:00Z | 2010-08-16 12:13:30.703 |
| 14 | 2734 | 5 | 12999 | 2009-07-29T00:00:00Z | 2010-03-04 13:00:30.223 | 3 | 3 | 3 | 0 | 2007-11-27T00:00:00Z | 2010-08-16 12:13:30.703 |
| 15 | 2734 | 149 | 15165 | 2010-03-04T00:00:00Z | 2010-08-16 12:13:30.703 | 3 | 4 | 4 | 0 | 2007-11-27T00:00:00Z | 2010-08-16 12:13:30.703 |
| 16 | 2734 | 8 | 17044 | 2010-08-16T00:00:00Z | 2010-09-12 16:29:01.203 | 13 | 5 | 1 | 4 | 2010-08-16T00:00:00Z | 2011-03-15 17:57:48.027 |
| 8 | 2734 | 146 | 17453 | 2010-09-12T00:00:00Z | 2010-11-11 15:58:25.043 | 13 | 6 | 2 | 4 | 2010-08-16T00:00:00Z | 2011-03-15 17:57:48.027 |
| 9 | 2734 | 8 | 18180 | 2010-11-11T00:00:00Z | 2011-03-15 17:57:48.027 | 13 | 7 | 3 | 4 | 2010-08-16T00:00:00Z | 2011-03-15 17:57:48.027 |
| 10 | 2734 | 8 | 21606 | 2011-10-18T15:42:36Z | 2011-11-11 16:42:54.787 | 13 | 9 | 4 | 5 | 2011-10-18T15:42:36Z | 2011-11-11 16:42:54.787 |
| 11 | 2734 | 8 | 21982 | 2011-11-14T11:18:24Z | 2012-04-05 16:21:41.230 | 13 | 11 | 5 | 6 | 2011-11-14T11:18:24Z | 2012-12-04 11:32:47.433 |
| 3 | 2734 | 271 | 23599 | 2012-04-05T16:21:41Z | 2012-12-04 11:32:47.433 | 13 | 12 | 6 | 6 | 2011-11-14T11:18:24Z | 2012-12-04 11:32:47.433 |
| 7 | 2734 | 145 | 19436 | 2011-03-15T00:00:00Z | 2011-10-18 15:42:36.877 | 906 | 8 | 1 | 7 | 2011-03-15T00:00:00Z | 2011-10-18 15:42:36.877 |
| 12 | 2734 | 264 | 21958 | 2011-11-11T16:42:54Z | 2011-11-14 11:18:24.057 | 906 | 10 | 2 | 8 | 2011-11-11T16:42:54Z | 2011-11-14 11:18:24.057 |
| 2 | 2734 | 29 | 39405 | 2015-03-06T11:51:09Z | 2016-01-27 13:10:19.720 | 3 | 16 | 5 | 11 | 2015-03-06T11:51:09Z | 2016-01-27 13:10:19.720 |
| 4 | 2734 | 107 | 26479 | 2012-12-04T11:32:47Z | 2013-03-19 09:07:13.633 | 14 | 13 | 1 | 12 | 2012-12-04T11:32:47Z | 2013-10-17 16:08:53.120 |
| 5 | 2734 | 297 | 28497 | 2013-03-19T09:07:13Z | 2013-10-17 16:08:53.120 | 14 | 14 | 2 | 12 | 2012-12-04T11:32:47Z | 2013-10-17 16:08:53.120 |
| 1 | 2734 | 195 | 31860 | 2013-10-17T16:08:53Z | 2015-03-06 11:51:09.440 | 5 | 15 | 1 | 14 | 2013-10-17T16:08:53Z | 2015-03-06 11:51:09.440 |
| 17 | 2734 | 891 | 45453 | 2016-01-27T13:10:19Z | (null) | 906 | 17 | 3 | 14 | 2013-10-17T16:08:53Z | 2015-03-06 11:51:09.440 |