Multiple case with different table - sql

Question

I have a query like this:
select U.Name,U.Adluserid as 'Empid',
min(case when IOType=0 then Edatetime end) as 'IN',
max(case when IOType=1 then Edatetime end) as 'out'
from Mx_ACSEventTrn
inner join Mx_UserMst U on Mx_ACSEventTrn.UsrRefcode=U.UserID
left join Tbl_Zeo_Empstatus E on Mx_ACSEventTrn.UsrRefcode=E.Emp_Id
where cast(Edatetime as date) between '2019-10-30' and '2019-10-30'
group by U.Name,U.Adluserid
output
Name Empid IN OUT status
JAS 505 2019-10-30 08:06:37.000 2019-10-30 14:13:29.000 Present
SAAJ 516 2019-10-30 08:05:11.000 2019-10-30 14:17:58.000 Absent
ram 516 2019-10-30 08:20:11.000 2019-10-30 14:17:58.000 Late
I have a another table like this: Tbl_Zeo_Empstatus
Emp_Id Status
123 2
504 2
505 3
I want to show the status column depend on this condition. If IN time
is not null then check the time more than 8.15 AM. If it is more than
8.15 AM then show late other wise show present.
IF in time is null then check the status of employee from this
table "Tbl_Zeo_Empstatus", if status 2 then show "Absent" if status 3
then show "Vacation" like this.
How I can achieve this?

Answer 1

What you need is an additional query level (sub-select) to be able to operate on in and out time which are aggregates (min and max). To be able to join your data with Tbl_Zeo_Empstatus we need to provide outer query with u.UserID and then perform a left join based on that column.
Final query just needs a CASE expression to evaluate your conditions and set expected status based on in time column.
select
t.Name,
t.Empid,
t.t_in,
t.t_out,
case
when t.t_in is null and E.status = 2 then 'Absent'
when t.t_in is null and E.status = 3 then 'Vacation'
when cast(t.t_in as time) > '08:15' then 'Late' else 'Present'
end as status
from (
select
u.UserID,
u.Name,
u.Adluserid as empid,
min(case when IOType=0 then Edatetime end) as t_in,
max(case when IOType=1 then Edatetime end) as t_out,
from
Mx_ACSEventTrn t
inner join Mx_UserMst u on t.UsrRefcode = u.UserID
where
cast(Edatetime as date) between '2019-10-30' and '2019-10-30'
group by
u.UserId, u.Name, u.Adluserid
) t
left join Tbl_Zeo_Empstatus e on t.UserID = e.Emp_Id

Answer 2

try to avoid inner select like this
select
u.UserID,
u.Name,
u.Adluserid as empid,
min(case when IOType=0 then Edatetime end) as t_in,
max(case when IOType=1 then Edatetime end) as t_out
into #tmp
from
Mx_ACSEventTrn t
inner join Mx_UserMst u on t.UsrRefcode = u.UserID
where
cast(Edatetime as date) between '2019-10-30' and '2019-10-30'
group by
u.UserId, u.Name, u.Adluserid
select
t.Name,
t.Empid,
t.t_in,
t.t_out,
case
when t.t_in is null and E.status = 2 then 'Absent'
when t.t_in is null and E.status = 3 then 'Vacation'
when cast(t.t_in as time) > '08:15' then 'Late' else 'Present'
end as status
from
#tmp t
left join Tbl_Zeo_Empstatus e on t.UserID = e.Emp_Id