sql server状态更改时间

您能帮我创建一个select来计算从打开到关闭的类型更改之间的时间差吗

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我需要成为不同号码的通用号码。

Minutes

THENUMBER       NUMBER      SYSMODTIME              TYPE
ACTIM2816332    IM0540202   2014-11-18 09:17:53.000 Closed
ACTIM2806050    IM0540202   2014-11-13 15:11:29.000 Update
ACTIM2806051    IM0540202   2014-11-13 15:11:29.000 External Vendor Assignment
ACTIM2806049    IM0540202   2014-11-13 15:11:29.000 Status Change
ACTIM2806046    IM0540202   2014-11-13 15:10:34.000 Assignment
ACTIM2804167    IM0540202   2014-11-13 09:31:12.000 Status Change
ACTIM2804166    IM0540202   2014-11-13 09:31:12.000 Assignment
ACTIM2802130    IM0540202   2014-11-12 17:09:57.000 Open

SELECT NUMBER, MAX([SYSMODTIME]) AS Closed, MIN([SYSMODTIME]) AS Open,
(DATEDIFF (mi, MAX([LoginDateTime]), MIN([SYSMODTIME]))) AS [datediff]
FROM table
GROUP BY NUMBER

小时数

THENUMBER       NUMBER      SYSMODTIME              TYPE
ACTIM2816332    IM0540202   2014-11-18 09:17:53.000 Closed
ACTIM2806050    IM0540202   2014-11-13 15:11:29.000 Update
ACTIM2806051    IM0540202   2014-11-13 15:11:29.000 External Vendor Assignment
ACTIM2806049    IM0540202   2014-11-13 15:11:29.000 Status Change
ACTIM2806046    IM0540202   2014-11-13 15:10:34.000 Assignment
ACTIM2804167    IM0540202   2014-11-13 09:31:12.000 Status Change
ACTIM2804166    IM0540202   2014-11-13 09:31:12.000 Assignment
ACTIM2802130    IM0540202   2014-11-12 17:09:57.000 Open

SELECT NUMBER, MAX([SYSMODTIME]) AS Closed, MIN([SYSMODTIME]) AS Open,
(DATEDIFF (mi, MAX([LoginDateTime]), MIN([SYSMODTIME]))) AS [datediff]
FROM table
GROUP BY NUMBER

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你想要什么区别？分钟、小时、天等？非常感谢，类型从open更改为assignment之间的时间差如何？这将涉及datediff中的子查询，因为它将是open的分钟（时间），然后是从表中选择的时间，其中type=open group by number，或者类似的内容。最好单独问：）