有开始和结束日期的问题

Question

我需要输出看起来像这样： ClientID，Session，Duration，TimeStamp_Start，TimeStamp_End

这是我的查询到目前为止的样子：

SELECT     ClientID, Session, Duration, MIN(TimeStamp) AS TimeStamp_Start, MAX  
(TimeStamp) AS TimeStamp_End
FROM         dbo.tblHistory
WHERE     (TimeStamp >= DATEADD(yy, - 1, GETDATE()))
GROUP BY ClientID, Session, Duration

虽然我得到了这个输出。

zsw@sdfs  00000020  0     2013-08-13 13:18:58.000  2013-08-13 13:18:58.000
zsw@sdfs  00000020  16112 2013-08-13 17:47:30.000  2013-08-13 17.47.30.000

我希望输出看起来像这样

ClientID  Session  Duration  TimeStamp_Start          TimeStamp_End

zsw@sdfs  00000020  16112  2013-08-13 13:18:58.000  2013-08-13 17.47.30.000

么？

Answer 1

SELECT     ClientID, Session, SUM(Duration), MIN(TimeStamp) AS TimeStamp_Start, MAX  
(TimeStamp) AS TimeStamp_End
FROM         dbo.tblHistory
WHERE     (TimeStamp >= DATEADD(yy, - 1, GETDATE()))
GROUP BY ClientID, Session