计算开启和关闭状态行之间的时间SQL Server

Question

我正在使用SQL Server 2008，如何计算开启和关闭状态之间的时间？我有以下表（由timestamp订购）：

ID | EQUIP_ID | TIMESTAMP   | STATUS (1 on/0 off) 
1 |  1 | 21/05/2012 13:00:00 | 1 
3 |  1 | 21/05/2012 13:04:00 | 1 
4 |  1 | 21/05/2012 13:05:00 | 0 
6 |  1 | 21/05/2012 13:09:00 | 1 
7 |  1 | 21/05/2012 13:10:00 | 1 
9 |  1 | 21/05/2012 13:12:00 | 1 
10 |  1 | 21/05/2012 13:13:00 | 0 
10 |  1 | 21/05/2012 13:14:00 | 1 
10 |  1 | 21/05/2012 13:15:00 | 0 

我期待这样的结果：

EQUIP_ID | START    |   END   | STATUS 
    1 | 21/05/2012 13:00:00 | 21/05/2012 13:05:00 | 1  (WORKING) 
    1 | 21/05/2012 13:05:00 | 21/05/2012 13:09:00 | 0  (STOPPED) 
    1 | 21/05/2012 13:09:00 | 21/05/2012 13:13:00 | 1 
    1 | 21/05/2012 13:13:00 | 21/05/2012 13:14:00 | 0 
    1 | 21/05/2012 13:14:00 | 21/05/2012 13:15:00 | 1 

我已经试过了差距和岛屿的一些功能，但没有工作，我不知道我失踪了什么...

Answer 1

以下是一张就可以了。假设你的表被称为“迈德特”：

WITH operating AS 
(
    SELECT 
     d.EQUIP_ID 
     , d.[TIMESTAMP] 
     , d.[STATUS] 
     , ROW_NUMBER() OVER (PARTITION BY EQUIP_ID ORDER BY [TIMESTAMP]) RowNum 
     , ROW_NUMBER() OVER (PARTITION BY EQUIP_ID ORDER BY [TIMESTAMP]) - 
      ROW_NUMBER() OVER (PARTITION BY EQUIP_ID, [STATUS] ORDER BY [TIMESTAMP]) AS [Group] 
    FROM 
     MyData d 
) 
SELECT 
    state1.EQUIP_ID 
    , MIN(state1.[TIMESTAMP]) [START] 
    , MAX(state2.[TIMESTAMP]) [END] 
    , state1.STATUS 
FROM 
    operating state1 
LEFT JOIN 
    operating state2 
    ON 
    state1.RowNum = state2.RowNum - 1 
WHERE 
    state2.[TIMESTAMP] IS NOT NULL 
GROUP BY 
    state1.EQUIP_ID, state1.[STATUS], state1.[Group] 
ORDER BY 
    MIN(state1.[TIMESTAMP]) 

它利用ROW_NUMBER()功能的确定状态的每个EQUIP_ID变化。然后它只是发现状态何时开始（MIN([TIMESTAMP])），然后我将它与下一行中的结束时间（MAX([TIMESTAMP])）进行匹配（请参阅RowNum上的自加入）。 WHERE消除了没有结束时间的最后一行。我得到的结果是：

EQUIP_ID | START     | END      | STATUS 
---------+-------------------------+-------------------------+------- 
     1 | 2012-05-21 13:00:00.000 | 2012-05-21 13:05:00.000 |  1 
     1 | 2012-05-21 13:05:00.000 | 2012-05-21 13:09:00.000 |  0 
     1 | 2012-05-21 13:09:00.000 | 2012-05-21 13:13:00.000 |  1 
     1 | 2012-05-21 13:13:00.000 | 2012-05-21 13:14:00.000 |  0 
     1 | 2012-05-21 13:14:00.000 | 2012-05-21 13:15:00.000 |  1 

Answer 2

这种方法首先过滤出重复的和重复关闭的行。只剩下状态开关，可以通过搜索基于row_number的下一行来检索“结束时间”。

; with numbered as 
     (
     select row_number() over (partition by equip_id order by timestamp) rn 
     ,  * 
     from YourTable 
     ) 
,  nodups as 
     (
     select row_number() over (partition by cur.equip_id order by cur.timestamp) rn 
     ,  cur.equip_id 
     ,  cur.timestamp 
     ,  cur.status 
     from numbered cur 
     left join  
       numbered prev 
     on  cur.rn = prev.rn + 1 
       and cur.status = prev.status 
     where prev.id is null 
     ) 
select cur.rn 
,  cur.equip_id 
,  cur.timestamp as StartTime 
,  next.timestamp as EndTime 
,  cur.status 
from nodups cur 
left join  
     nodups next 
on  next.rn = cur.rn + 1 
     and next.equip_id = cur.equip_id 

Live example at SQL Fiddle.