我如何在sql中显示每个日期的最后一个事件

Question

我有很多ID，每个ID有很多日期和小时，我想为每个ID显示第一个事件

表格例如：

id  eventid   time
1   2         1-1-2018 05:06:03:000
1   3         1-1-2018 08:05:54:000
1   4         1-1-2018 19:05:54:000
1   5         1-1-2018 24:05:54:000

我想做一个这样的表：

id  eventid   time
1   2         1-1-2018 05:06:03:000
1   5         1-1-2018 24:05:54:000

Answer 1

with cte as 
 (
   select *
     -- get min & max per date
     ,min(time) over (partition by cast(time as date)) as mintime
     ,max(time) over (partition by cast(time as date)) as maxtime
   from tab
 )
select *
from cte 
where time in (mintime,maxtime)