How to count employees per hour working in between hours? - sql

Question

How to count employees per hour working in between intime and outtime hours.
I have below table format with intime,outtime of employee .
My Table :
emp_reader_id att_date in_time out_time Shift_In_Time Shift_Out_Time
111 2020-03-01 2020-03-01 08:55:24.000 2020-03-01 10:26:56.000 09:00:00.0000000 10:30:00.0000000
112 2020-03-01 2020-03-01 08:45:49.000 2020-03-01 11:36:14.000 09:00:00.0000000 11:30:00.0000000
113 2020-03-01 2020-03-01 10:58:19.000 2020-03-01 13:36:31.000 09:00:00.0000000 12:00:00.0000000
Need to count the employee in the below format.
Expected Output:
Period Working Employee Count
0 - 1 0
1 - 2 0
2 - 3 0
3 - 4 0
4 - 5 0
5 - 6 0
6 - 7 0
7 - 8 0
8 - 9 2
9 - 10 2
10 - 11 3
11 - 12 2
12 - 13 1
13 - 14 1
14 - 15 0
15 - 16 0
16 - 17 0
17 - 18 0
18 - 19 0
19 - 20 0
20 - 21 0
21 - 22 0
22 - 23 0
23 - 0 0
I tried with below query with my raw data , but it will not work i need from above table
SELECT
(DATENAME(hour, C.DT) + ' - ' + DATENAME(hour, DATEADD(hour, 2, C.DT))) as PERIOD,
Count(C.EVENTID) as Emp_Work_On_Time
FROM
trnevents C
WHERE convert(varchar(50),C.DT,23) ='2020-03-01'
GROUP BY (DATENAME(hour, C.DT) + ' - ' +
DATENAME(hour, DATEADD(hour, 2, C.DT)))

Answer 1

you need to have a list of hours (0 to 23) and then left join to your table.
The following query uses recursive cte to generate that list. You may also use VALUES constructor or TALLY table. Which will gives same effect
; with hours as
(
select hour = 0
union all
select hour = hour + 1
from hours
where hour < 23
)
select convert(varchar(2), h.hour) + ' - ' + convert(varchar(2), (h.hour + 1) % 24) as [Period],
count(t.emp_reader_id) as [Working Employee Count]
from hours h
left join timesheet t on h.hour >= datepart(hour, in_time)
and h.hour <= datepart(hour, out_time)
group by h.hour
Demo : db<>fiddle

Answer 2

Hope that might help but take a look how shift in and shift out are in the code... seems to me its automatic so it could have all you need
SELECT COUNT(Idemp) from aaShiftCountEmp WHERE in_time<'2020-03-01 09:00:00.000' AND out_time>'2020-03-01 10:00:00.000'
this is just example for 9h to 10h but u can make it auto,
btw are u sure that this shoul not show SHIFT ppl cOUNT? i mean u sure 0-1, 1-2 instead of 0-1.30, 1.30-3?? etc?