计算实际停机时间而忽略日期时间的重叠

更新了新的测试案例

这是一种计算唯一中断的技术，然后将其与导致中断的初始停机时间对齐，以使实际值与预期值相匹配。

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 ActualFROM @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

这将产生所需的输出：

Application    DowntimeStartDowntimeEnd  Expected    Actual------------------------- ----------------------- ----------------------- ----------- -----------Application Demo          2014-11-20 17:31:01.467 2014-11-20 18:01:01.243 30          30Application Demo          2014-11-28 17:59:00.987 2014-11-28 18:09:02.167 26          26Application Demo          2014-11-28 18:00:01.403 2014-11-28 18:25:01.443 00Application Demo          2014-11-29 19:13:08.580 2014-11-30 05:30:01.763 617         617Application Demo          2014-11-30 01:55:01.953 2014-11-30 03:54:01.730 00Application Demo 2        2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 3514        3514Application Demo 2        2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 00Application Demo 2        2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 00Application Demo 2        2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 00Application Demo 2        2014-12-19 23:09:01.303 2014-12-22 09:43:01.397 00