查询以获得每个组的最大时间

-1

我有以下格式的数据并希望以第二种格式输出它。我已经尝试了自己的数据和组的自我加入ID，时间和事件，但没有我试过似乎正常工作。查询以获得每个组的最大时间

EV-2的时间是开始时间，EV-5的时间是结束时间。 EV-5时间可以写为每个EV-2-EV-5事件的结束时间。

感谢您对此事的任何指导。

ID TIME      EVENT 
1 2016-03-21 12:30:00.000  EV-1  
1 2016-03-21 12:30:30.000  EV-2 
1 2016-03-21 12:33:00.000  EV-3 
1 2016-03-21 12:33:00.000  EV-4 
1 2016-03-21 12:33:45.000  EV-5 
1 2016-03-21 12:33:50.000  EV-1  
1 2016-03-21 12:33:55.000  EV-2 
1 2016-03-21 12:35:15.000  EV-3 
1 2016-03-21 12:35:15.000  EV-4 
1 2016-03-21 12:40:20.000  EV-5 
2 2016-03-21 12:40:50.000  EV-1  
2 2016-03-21 12:41:25.000  EV-2 
2 2016-03-21 12:41:25.000  EV-3 
2 2016-03-21 12:42:13.000  EV-4 
2 2016-03-21 12:47:35.000  EV-5 

Output 
ID TIME(startTime)    EVENT endTime 
1 2016-03-21 12:30:00.000  EV-1  
1 2016-03-21 12:30:30.000  EV-2 2016-03-21 12:33:45.000 
1 2016-03-21 12:33:00.000  EV-3 2016-03-21 12:33:45.000 
1 2016-03-21 12:33:00.000  EV-4 2016-03-21 12:33:45.000 
1 2016-03-21 12:33:45.000  EV-5 2016-03-21 12:33:45.000 
1 2016-03-21 12:33:50.000  EV-1  
1 2016-03-21 12:33:55.000  EV-2 2016-03-21 12:40:20.000 
1 2016-03-21 12:35:15.000  EV-3 2016-03-21 12:40:20.000 
1 2016-03-21 12:35:15.000  EV-4 2016-03-21 12:40:20.000 
1 2016-03-21 12:40:20.000  EV-5 2016-03-21 12:40:20.000 
2 2016-03-21 12:40:50.000  EV-1  
2 2016-03-21 12:41:25.000  EV-2 2016-03-21 12:47:35.000 
2 2016-03-21 12:41:25.000  EV-3 2016-03-21 12:47:35.000 
2 2016-03-21 12:42:13.000  EV-4 2016-03-21 12:47:35.000 
2 2016-03-21 12:47:35.000  EV-5 2016-03-21 12:47:35.000

我已经试过：

select d.ID, d.TIME, d.EVENT, max(dd.TIME) endTime 
from dataTable d 
    inner join dataTable dd on d.ID = dd.ID and d.EVENT = dd.EVENT and d.TIME < dd.TIME 
group by d.ID, d.TIME, d.EVENT

来源

2016-04-27 Milton S.

什么是你的DBMS？ – Siyual

你可以显示你的查询吗？ –

选择d.ID，d.TIME，d.EVENT，最大值（dd.TIME）从dataTable中d ENDTIME 内上d.ID = dd.ID和 d.EVENT = dd.EVENT和加入的dataTable DD d.TIME

简单的解决方案，使用相关子选择返回最小的EV-5时间大于或等于当前行的时间。（有一个case表达对所有事件，但EV-1这样做）

select t1.*, case when t1.event <> 'EV-1' then (select min(t2.TIME) from dataTable t2 
               where t2.event = 'EV-5' 
                and t2.TIME >= t1.time) 
      end as endTime 
from dataTable t1

另外，如果id可以使用，做一个自我（左）参加：

select t1.*, case when t1.event <> 'EV-1' then t2.TIME 
      end as endTime 
from dataTable t1 
    left join dataTable t2 on t1.id = t2.id and t2.event = 'EV-5'

（left join到也返回的ID没有任何EV-5，如果需要的话）

来源

2016-04-27 14:43:45 jarlh

它看起来事件是通过ID链接... – dotjoe

@dotjoe，很好的观察。错过了细节！ – jarlh

@ jarhl的逻辑的DBMS支持如SQL Server 2014窗聚合函数：

SELECT t.*, 
    CASE 
    WHEN EVENT <> 'EV-1' 
    THEN MIN(CASE WHEN EVENT = 'EV-5' THEN TIME end) 
      OVER (PARTITION BY ID -- maybe not needed 
       ORDER BY TIME 
       ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) 
    END AA endTime 
FROM tablename AS t1

来源

2016-04-27 14:57:22 dnoeth

谢谢！你的解决方案工作得很好，正是我所期待的。 –

纠正你的ID列到实际ID，尝试

IF (SELECT OBJECT_ID('tempdb..#Events')) IS NOT NULL 
BEGIN 
    DROP TABLE #Events 
END 

CREATE TABLE #Events (ID INT,EventTime datetime, eventName varchar(4)) 
INSERT INTO #Events 
VALUES   
(1, '2016-03-21 12:30:00.000','EV-1'), 
(1, '2016-03-21 12:30:30.000','EV-2'), 
(1, '2016-03-21 12:33:00.000','EV-3'), 
(1, '2016-03-21 12:33:00.000','EV-4'), 
(1, '2016-03-21 12:33:45.000','EV-5'), 
(2, '2016-03-21 12:33:50.000','EV-1'), 
(2, '2016-03-21 12:33:55.000','EV-2'), 
(2, '2016-03-21 12:35:15.000','EV-3'), 
(2, '2016-03-21 12:35:15.000','EV-4'), 
(2, '2016-03-21 12:40:20.000','EV-5'), 
(3, '2016-03-21 12:40:50.000','EV-1'), 
(3, '2016-03-21 12:41:25.000','EV-2'), 
(3, '2016-03-21 12:41:25.000','EV-3'), 
(3, '2016-03-21 12:42:13.000','EV-4'), 
(3, '2016-03-21 12:47:35.000','EV-5') 
; 
WITH cteEvent AS 
(
    SELECT ID, EventTime AS startTime,en.endTime 
    FROM #Events e 
    CROSS APPLY (
        SELECT EventName,EventTime AS endTime 
        FROM #Events e2 
        WHERE e2.ID = e.id AND CAST(RIGHT(e2.eventname,1) AS INT) = 5) as en 
    WHERE e.EventName = 'EV-1' 
) 
SELECT c.id,eventName,startTime, 
    CASE 
     WHEN eventName = 'EV-1' 
     THEN NULL 
     ELSE endTime 
    END AS endTime 
FROM cteEvent c 
LEFT JOIN #Events e ON c.id = e.id

来源

2016-04-27 15:23:32

查询以获得每个组的最大时间

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