declare @t table (EmployeID int, DT	DateTime,MS varchar(10))

insert @t
values(111,'2019-09-05 11:00:00','Enter'),
(222,'2019-09-05 12:00:00','Enter'),
(111,'2019-09-06 14:30:00',	'Exit'),
(333,'2019-09-06 15:30:00',	'Enter'),
(111,'2019-09-07 16:00:00',	'Enter'),
(222,'2019-09-07 17:00:00',	'Exit'),
(111,'2019-09-08 08:00:00',	'Exit')

;with En as(
select*
,row_number() over(partition by EmployeID order by DT) as num
from @t
where MS = 'Enter'
),
ex as(
select*
,row_number() over(partition by EmployeID order by DT) as num
from @t
where MS = 'Exit'
)
select a.EmployeID,a.DT as Enter,datediff(HH,a.DT,b.DT) Total
from En a
left join Ex b on a.EmployeID = b.EmployeID
and a.num = b.num
order by a.DT