Calculate employee shift based on 1st login of the day - sql

Question

I want to calculate employees shift based on his system login time ,i am able to calculate shifts based on login times .now i want to calculate shift only for 1st login entry for given day if there are multiple logins for same day.Please help how i can do this .
**
SQL Query :
WITH shiftalloence AS
(
SELECT (timesheet.start_time_server) ,
users.first_name + ' ' + users.last_name AS employee_name ,
CASE
WHEN Dateadd(d, -Datediff(d, 0, dbo.[timesheet].start_time_server), dbo.[timesheet].start_time_server) BETWEEN '05:30:00' AND '08:00:00' THEN 'Morning'
WHEN Dateadd(d, -Datediff(d, 0, dbo.[timesheet].start_time_server), dbo.[timesheet].start_time_server) BETWEEN '08:01:00' AND '11:00:00' THEN 'General'
WHEN Dateadd(d, -Datediff(d, 0, dbo.[timesheet].start_time_server), dbo.[timesheet].start_time_server) BETWEEN '11:05:00' AND '18:00:00' THEN 'Evening'
ELSE '0'
END AS shift
FROM timesheet
JOIN users
ON timesheet.user_id=users.user_id
WHERE Month(start_time_server)=Month(Getdate())
AND Datename(weekday,timesheet.start_time_server) IN 'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday')
AND
start_time_server NOT IN
(
SELECT timesheet.start_time_server
FROM timesheet
JOIN leaves
ON timesheet.user_id=leaves.user_id
WHERE CONVERT(varchar(10),timesheet.start_time_server,111) =CONVERT(varchar(10),leaves.start_time_server,111)
AND task_type_name IN ('leave',
'Half Day') )), tt AS
(
SELECT shiftalloence.employee_name ,
count(
CASE
WHEN shift = 'Morning' THEN 1
ELSE NULL
END) AS 'Morning',
count(
CASE
WHEN shift = 'General' THEN 1
ELSE NULL
END) AS 'General' ,
count(
CASE
WHEN shift = 'Evening' THEN 1
ELSE NULL
END) AS 'Evening'
FROM shiftalloence
GROUP BY employee_name )SELECT *
FROM tt
**

Answer 1

Could you just simply distinct select and order by ASC or DESC depending on the dates? This would allow you to show just the shift/day/id you're wanting and showing you the first time they logged in because you're ordered it in the way you're wanting.
This works because if you get back 3 rows and order by the datetime asc/desc you can also simply do select top(1). It'll grab just the top record in that list for that shift/day/person.
Small example of what I am saying:
SELECT TOP 1 * FROM Employees
order by datetime asc;
Something like that.