SQL Server 2008 查询以计算连续事件之间的总时间

Question

我希望能够计算 SQL Server 2008 中某些事件之间的总时间。

我有一张如下表：

UserId   Event      EventTimestamp
+-------+----------+---------------+
 1       CheckedIn  14-05-15 10:01
 2       CheckedIn  14-05-15 10:15
 3       CheckedIn  14-05-15 10:17
 1       CheckedOut 14-05-15 10:25
 1       Logout     14-05-15 10:26

如果您查看表格，用户可以签入，然后可以签出，然后下线。

我想计算一个人从签到到签出点之间的时间，按每周分组，其中持续时间（签到和签出之间）小于 10 分钟。

到目前为止，我已经设法按周分组，但我似乎无法计算这些事件之间的持续时间（将按此顺序发生）...

select      
   'Week ' + cast(datepart(wk, EventUpdateStamp) as varchar(2)) Week,     
    UserId,
    Event 
from MyTable 
group by datepart(wk, EventUpdateStamp), UserId, Event 

我想要这样的结果：

UserId   TotalSessionCheckInTimeMinutes  WeekNumber   
+-------+------------------------------+---------------+
 1       24                             43

以第一行为例：

• 1 是用户 ID
• 24 是他之间的总持续时间（以分钟为单位） 入住和退房
• 43 是一年中的第几周

我只想将入住加入退房。不想在签出和注销之间进行衡量（换句话说，衡量他签入的时间）。

Answer 1

试试这个：

SELECT t1.UserId, 
    DATEDIFF(minute,
        t1.EventTimestamp,
        (SELECT MIN(t3.EventTimestamp)
        FROM MyTable t3
        WHERE t3.UserId = t1.UserId
        AND t3.EventTimestamp> t1.EventTimestamp)
    ), 
   CAST(DATEPART(wk, EventTimestamp) as varchar(2)) Week
FROM MyTable t1
WHERE EXISTS(
    SELECT 'NEXT'
    FROM MyTable t2
   WHERE t2.UserId = t1.UserId
   AND t2.EventTimestamp> t1.EventTimestamp
   AND t2.Event != 'Logout')

SqlFiddle

去here

Answer 2

你可以试试这个：

SELECT DISTINCT M.UserId, DATEPART(HOUR,A.TotalSessionCheckInTimeMinutes)*60 + DATEPART(MINUTE,A.TotalSessionCheckInTimeMinutes) AS TotalSessionCheckInTimeMinutes, DATEPART(WEEKDAY, M.EventTimestamp) FROM Mytable M
     CROSS APPLY (
        SELECT CAST((M1.EventTimestamp - M2.EventTimestamp) AS TIME) AS TotalSessionCheckInTimeMinutes
        FROM Mytable M1
          CROSS JOIN Mytable M2
            WHERE M1.Event = 'CheckOut' AND M2.Event = 'CheckIn' AND M1.UserId = M.UserId) AS A
UNION ALL
SELECT DISTINCT M.UserId, A.TotalSessionCheckInTimeMinutes, DATEPART(WEEKDAY, M.EventTimestamp) FROM Mytable M
     CROSS APPLY (
       SELECT CAST((M1.EventTimestamp - M2.EventTimestamp) AS TIME) AS TotalSessionCheckInTimeMinutes
       FROM Mytable M1
          CROSS JOIN Mytable M2
            WHERE M1.Event = 'LogOut' AND M2.Event = 'CheckIn' AND M1.UserId = M.UserId) AS A