我正在尝试计算如何根据我在表中存储的数据计算各种应用程序的实际停机时间。
目前我只计算DowntimeStart和DowntimeEnd之间的差异，它显示在DowntimeMinutes中。
问题在于，如果由于单独的组件出现故障而导致交叉，则应计算忽略重叠的总数。
我期望的内容显示在预期专栏中。
关于如何将查询组合在一起以实现此目的的任何想法？
Application DowntimeStart DowntimeEnd DowntimeMinutes Expected
Application Demo 2014-11-20 17:31:01.467 2014-11-20 18:01:01.243 30 30
Application Demo 2014-11-28 17:59:00.987 2014-11-28 18:09:02.167 10 26
Application Demo 2014-11-28 18:00:01.403 2014-11-28 18:25:01.443 25 0
Application Demo 2014-11-29 19:13:08.580 2014-11-30 05:30:01.763 617 617
Application Demo 2014-11-30 01:55:01.953 2014-11-30 03:54:01.730 119 0
我已经看了一下并调查了这些选项，但他们没有实现上述目标：
Find Total Minutes Ignoring Overlap (Convert Cursor based Answer to CTE)
SQL to find time elapsed from multiple overlapping intervals
http://www.experts-exchange.com/Database/MS-SQL-Server/SQL_Server_2008/Q_28169653.html
http://thehobt.blogspot.com.au/2009/04/calculating-elapsed-time-based-upon.html
答案 0 :(得分：0)
更新新测试案例
这是一种计算唯一中断的技术，然后将它们与初始停机时间对齐，从而导致停机，以使实际值和预期值匹配。
DECLARE @Downtime TABLE (
ID INT PRIMARY KEY NOT NULL IDENTITY(1,1),
Application VARCHAR(25),
DowntimeStart DATETIME,
DowntimeEnd DATETIME,
Expected INT
)
INSERT @Downtime (Application, DowntimeStart, DowntimeEnd, Expected) VALUES -- Act/Exp
('Application Demo', '2014-11-20 17:31:01.467', '2014-11-20 18:01:01.243', 30) -- 30/30
,('Application Demo', '2014-11-28 17:59:00.987', '2014-11-28 18:09:02.167', 26) -- 10/26
,('Application Demo', '2014-11-28 18:00:01.403', '2014-11-28 18:25:01.443', 0) -- 25/0
,('Application Demo', '2014-11-29 19:13:08.580', '2014-11-30 05:30:01.763', 617) -- 617/617
,('Application Demo', '2014-11-30 01:55:01.953', '2014-11-30 03:54:01.730', 0)
,('Application Demo 2', '2014-12-19 23:09:01.303', '2014-12-22 09:43:01.397', 3514)
,('Application Demo 2', '2014-12-19 23:09:01.303', '2014-12-22 09:43:01.397', 0)
,('Application Demo 2', '2014-12-19 23:09:01.303', '2014-12-22 09:43:01.397', 0)
,('Application Demo 2', '2014-12-19 23:09:01.303', '2014-12-22 09:43:01.397', 0)
,('Application Demo 2', '2014-12-19 23:09:01.303', '2014-12-22 09:43:01.397', 0)
SELECT
Downtimes.Application,
Downtimes.DowntimeStart,
Downtimes.DowntimeEnd,
Downtimes.Expected,
COALESCE(Actual, 0) AS Actual
FROM @Downtime Downtimes
LEFT OUTER JOIN (
SELECT DISTINCT
D1.Application,
MIN(CASE WHEN D1.DowntimeStart < D2.DowntimeStart THEN D1.ID ELSE D2.ID END) AS [ID],
MIN(CASE WHEN D1.DowntimeStart < D2.DowntimeStart THEN D1.DowntimeStart ELSE D2.DowntimeStart END) AS [DowntimeStart],
MAX(CASE WHEN D1.DowntimeEnd > D2.DowntimeEnd THEN D1.DowntimeEnd ELSE D2.DowntimeEnd END) AS [DowntimeEnd],
DATEDIFF(MINUTE,
MIN(CASE WHEN D1.DowntimeStart < D2.DowntimeStart THEN D1.DowntimeStart ELSE D2.DowntimeStart END),
MAX(CASE WHEN D1.DowntimeEnd > D2.DowntimeEnd THEN D1.DowntimeEnd ELSE D2.DowntimeEnd END)) AS Actual
FROM @Downtime D1
INNER JOIN @Downtime D2
ON D1.Application = D2.Application
AND (D1.DowntimeStart BETWEEN D2.DowntimeStart AND D2.DowntimeEnd
OR D2.DowntimeStart BETWEEN D1.DowntimeStart AND D1.DowntimeEnd)
GROUP BY
D1.Application,
D1.DowntimeStart
) Outages
ON Outages.ID = Downtimes.ID
这会产生所需的输出：
Application DowntimeStart DowntimeEnd Expected Actual
------------------------- ----------------------- ----------------------- ----------- -----------
Application Demo 2014-11-20 17:31:01.467 2014-11-20 18:01:01.243 30 30
Application Demo 2014-11-28 17:59:00.987 2014-11-28 18:09:02.167 26 26
Application Demo 2014-11-28 18:00:01.403 2014-11-28 18:25:01.443 0 0
Application Demo 2014-11-29 19:13:08.580 2014-11-30 05:30:01.763 617 617
Application Demo 2014-11-30 01:55:01.953 2014-11-30 03:54:01.730 0 0
Application Demo 2 2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 3514 3514
Application Demo 2 2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 0 0
Application Demo 2 2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 0 0
Application Demo 2 2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 0 0
Application Demo 2 2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 0 0
答案 1 :(得分：0)
我遇到了类似的问题，我在问题How to Consolidate Blocks of Time?
中得到了解答在你的情况下，这是通过顶部1自我外部应用来获得重叠，然后使用重叠的开始时间，或者如果为空，正常记录的结束时间作为时间结束。
CREATE TABLE Downtime (
Application VARCHAR(25),
DowntimeStart DATETIME,
DowntimeEnd DATETIME,
Expected INT
)
INSERT Downtime (Application, DowntimeStart, DowntimeEnd, Expected) VALUES -- Act/Exp
('Application Demo', '2014-11-20 17:31:01.467', '2014-11-20 18:01:01.243', 30) -- 30/30
,('Application Demo', '2014-11-28 17:59:00.987', '2014-11-28 18:09:02.167', 26) -- 10/26
,('Application Demo', '2014-11-28 18:00:01.403', '2014-11-28 18:25:01.443', 0) -- 25/0
,('Application Demo', '2014-11-29 19:13:08.580', '2014-11-30 05:30:01.763', 617) -- 617/617
,('Application Demo', '2014-11-30 01:55:01.953', '2014-11-30 03:54:01.730', 0)
SELECT
Records.Application, Records.DowntimeStart, Records.DowntimeEnd, Records.Expected
, DATEDIFF(minute, Records.DowntimeStart, COALESCE(Overlap.DowntimeStart, Records.DowntimeEnd)) AS Actual
-- , Overlap.Application, Overlap.DowntimeStart, Overlap.DowntimeEnd -- For Verification Purposes
FROM Downtime Records
OUTER APPLY (
SELECT TOP 1 Overlap.Application, Overlap.DowntimeStart, Overlap.DowntimeEnd
FROM Downtime Overlap
WHERE Records.Application = Overlap.Application
AND Overlap.DowntimeStart > Records.DowntimeStart
AND Overlap.DowntimeStart BETWEEN Records.DowntimeStart AND Records.DowntimeEnd
ORDER BY Overlap.DowntimeStart
) Overlap
这里是解决方案的SQLFiddle。