SQL中不同值的不同列

Question

我已经编写了这个 SQL 查询：

SELECT TOP (15) UserName, EventName, EventTime
FROM AttendanceEvents
WHERE UserName = 'Kareem'

这会导致：

如何将值分隔到事件的新列中？

我想要的输出是：

UserName | Login                | LogOut
Kareem    2015-04-13 01:43       2015-04-13 13:44
Kareem    2015-04-18 12:39       NULL
Kareem    2015-04-18 12:43       NULL
.
.
.
Kareem    2015-04-25 00:35       2015-04-25 05:21

Answer 1

通过取最小值来使用条件聚合

select username,cast(eventtime as date) as d, min(case when eventname='IN' then eventtime end) as login,
min(case when eventname='OUT' then eventtime end) as logout
from tablename
group by username,cast(eventtime as date)