Sql 获取最小和最大日期

我的问题是：

with 
  CTE (CardID,Name,Surname,Department,CurrentDate,Time_In,Time_Out) as (
    select CardID, Name, Surname, Department, convert(char, pocdate, 106) as CurrentDate,
           case when GateID in (1,6) then min(convert(char,pocdate,108)) else '' end as Time_In,
           case when GateID in (2,5) then max(convert(char,pocdate,108)) else '' end as Time_Out     
      from tblEmployee
     where Name = 'erdal'
     group by CardID,Name,Surname,Department,GateID,pocdate
)
select CardID,Name,Surname,Department,CurrentDate,Time_In,Time_Out
from CTE
group by CardID,Name,Surname,Department,CurrentDate,Time_In,Time_Out     
order by CardID asc;

结果:

 CardID    Name    Surname   Department   CurrentDate    Time_In    Time_Out
--------- ------- --------- ------------ ------------- ----------- ----------
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     12:41:32
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     17:38:21
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     08:01:53
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     08:03:24
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     13:22:22
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     13:26:47
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     17:36:46

是否有一种方法可以只找到最短的

输入时间

和最长的

输出时间

 CardID    Name    Surname   Department   CurrentDate    Time_In    Time_Out
--------- ------- --------- ------------ ------------- ----------- ----------
 6672983   ERDAL   HUZMELI   IT            11-Jan-16     08:01:53   17:38:21

---

您的查询似乎不需要CTE。您只需在一个步骤中完成聚合。您需要的是条件聚合：

Select CardID, Name, Surname, Department,
       convert(varchar(32), pocdate, 106) as CurrentDate,
       min(case when GateID in (1, 6) then convert(varchar(32), pocdate, 108))     
           end) as Time_In,
       max(case when GateID in (2, 5) then convert(varchar(32), pocdate, 108))     
           end) as Time_Out
from tblEmployee
where Name = 'erdal'
group by CardID, Name, Surname ,Department, kGateID,
         convert(varchar(32), pocdate, 106);

---

注意：在SQL Server中，使用

varchar（）

和

char（）

时，应始终包含长度。默认值因上下文而异，并且取决于默认值，可能会引入难以调试的错误。

只是不要在最后按时间输入和时间输出分组。