How to sum count in SQL Server? - sql-server

Question

When i used this to count how many employees working in each departments , its working fine :
-- Count
totals.Nr_Employees as TotalEmployees
LEFT JOIN
(select p1.DepartmentName, count(distinct u.Id) Nr_Employees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
) totals on totals.DepartmentName = p.DepartmentName
BUT, when i want to make total of count or sum count , i do something like this ,but its not working and i dont know its right way to do or not ! Can someone please point me in the right direction?
-- SUM
SummerCount.TotalEmployees as sumEmployees
LEFT JOIN
(select p1.DepartmentName, sum(count(distinct u.Id)) TotalEmployees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
) SummerCount on SummerCount.DepartmentName = p.DepartmentName
AND , put Querys together:
-- Count & SUM
totals.Nr_Employees as TotalEmployees,
SummerCount.TotalEmployees as sumEmployees
FROM
LEFT JOIN
(select p1.DepartmentName, count(distinct u.Id) Nr_Employees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
) totals on totals.DepartmentName = p.DepartmentName
LEFT JOIN
(select p1.DepartmentName, sum(count(distinct u.Id)) TotalEmployees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
) SummerCount on SummerCount.DepartmentName = p.DepartmentName
Screenshots (wrong sum):

Answer 1

Aggregate functions as operators of aggregate functions are not supported. This is, why your statment doe not work.
You can either use the WITH ROLLUP clause or put your statement into a subselect and build the sums in the outer statement.

Answer 2

Use a common table expression to get replace the first query, and select sum from that cte to replace the second one:
;WITH EmployeesCount AS
(
select p1.DepartmentName, count(distinct u.Id) Nr_Employees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
)
And then, in your main query:
...
LEFT JOIN
EmployeesCount As totals on totals.DepartmentName = p.DepartmentName
LEFT JOIN
(
SELECT SUM(Nr_Employees)
FROM EmployeesCount
) As SummerCount on SummerCount.DepartmentName = p.DepartmentName
Update
;WITH EmployeesCount AS
(
select p1.DepartmentName, count(distinct u.Id) Nr_Employees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
)
SELECT totals.Nr_Employees as TotalEmployees,
SummerCount.Nr_Employees as sumEmployees
FROM
dbo.Paychecks AS p INNER JOIN dbo.Users AS u ON u.Id=p.UserId
INNER JOIN dbo.EmploymentStatuses AS E ON E.Id = u.EmploymentStatusId
LEFT OUTER JOIN dbo.EmployeeTerminationQueue AS etq on etq.UserId = u.Id
LEFT OUTER JOIN dbo.TerminationReasons AS t on t.Id = etq.TerminationReasonid
LEFT JOIN EmployeesCount As totals on totals.DepartmentName = p.DepartmentName
CROSS JOIN
(
SELECT SUM(Nr_Employees) As Nr_Employees
FROM EmployeesCount
) As SummerCount
Full query
;WITH EmployeesCount AS
(
select p1.DepartmentName, count(distinct u.Id) Nr_Employees
from Paychecks p1
join Users u on u.Id = p1.UserId
where u.customerid=214 and u.isdeleted=0
group by p1.DepartmentName
)
SELECT DISTINCT u.Id, u.FirstName + ' ' + u.LastName AS Medarbajder,
u.SSN AS CPRNR,
(CASE
WHEN u.SSN IS NOT NULL THEN
DATEDIFF(YEAR,CONVERT(date,STUFF(LEFT(u.SSN, 4), 3, 0, '.') + '.' + CAST(DATEPART(YEAR, GETDATE()) / 100 - 1 as char(2)) + SUBSTRING(u.SSN, 5, 2), 104) , GETDATE())
ELSE
NULL
END) As Aldre ,
(CASE WHEN right(rtrim(SSN), 1) IN ('1', '3', '5', '7', '9') THEN 'M'
WHEN right(rtrim(SSN), 1) IN ('2', '4', '6', '8', '0') THEN 'K'
END) as Køn,
convert(varchar(10), p.WorkStartDate, 105) AS StartDato ,
(CASE
WHEN u.ResignationDate IS NOT NULL THEN
CONVERT(varchar(4), DATEDIFF(dd, WorkStartDate, u.ResignationDate)/365) + ' år '+
CONVERT(varchar(4), DATEDIFF(MONTH, WorkStartDate, u.ResignationDate) % 12) + ' måneder '+
CAST(DATEDIFF(dd, DATEADD(mm, DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, u.ResignationDate), WorkStartDate), u.ResignationDate),
DATEADD(yy, DATEDIFF(yy, WorkStartDate, u.ResignationDate), WorkStartDate)), u.ResignationDate) AS varchar(2)) +' dag '
ELSE
CONVERT(varchar(4), DATEDIFF(dd, WorkStartDate, GETDATE())/365) + ' år '+
CONVERT(varchar(4), DATEDIFF(MONTH, WorkStartDate, GETDATE()) % 12) + ' måneder '+
CAST(DATEDIFF(dd, DATEADD(mm, DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate), GETDATE()),
DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate)), GETDATE()) AS varchar(2)) +' dag ' end) as Ancinitet,
(CASE
WHEN u.ResignationDate IS NOT NULL THEN
DATEDIFF(day, WorkStartDate, u.ResignationDate)
ELSE
DATEDIFF(day, WorkStartDate, GETDATE())
end) as AncinitetAntalDag,
p.DepartmentName AS Afdelinger,
E.Name AS Ansættelsesstatus,
u.ResignationDate AS Opsigelsesdato,
(CASE WHEN etq.Id IS NOT NULL THEN t.Name ELSE 'Aktiv' END) AS Terminationreason,
totals.Nr_Employees as TotalEmployees,
SummerCount.Nr_Employees as sumEmployees
FROM
dbo.Paychecks AS p INNER JOIN dbo.Users AS u ON u.Id=p.UserId
INNER JOIN dbo.EmploymentStatuses AS E ON E.Id = u.EmploymentStatusId
LEFT OUTER JOIN dbo.EmployeeTerminationQueue AS etq on etq.UserId = u.Id
LEFT OUTER JOIN dbo.TerminationReasons AS t on t.Id = etq.TerminationReasonid
LEFT JOIN EmployeesCount As totals on totals.DepartmentName = p.DepartmentName
CROSS JOIN
(
SELECT SUM(Nr_Employees) As Nr_Employees
FROM EmployeesCount
) As SummerCount
WHERE u.CustomerId=214 AND u.IsDeleted = 0
AND etq.StartDate >= #EndDateFrom AND etq.StartDate <= #EndDateTo
AND
((#Gender != 'B' AND
#Gender = (CASE WHEN right(rtrim(SSN), 1) IN ('1', '3', '5', '7', '9') THEN 'M'
WHEN right(rtrim(SSN), 1) IN ('2', '4', '6', '8', '0') THEN 'K'
END))
OR
(#Gender = 'B'))
AND
((#TerminationReason != 0 AND #TerminationReason = (CASE WHEN etq.Id IS NOT NULL THEN t.Id ELSE 0 END))
OR
(#TerminationReason = 0))
AND u.EmploymentStatusId = 2
order by p.DepartmentName