How to use group by in SQL Server - sql

Question

Query:
SELECT
dbo.tblDivision.DivisionName, dbo.tblDistrict.DistrictName,
case
when Gender = 'Male'
then count(Gender)
end as male,
case
when Gender = 'female'
then count(Gender)
end as female,
UnitEName
FROM
dbo.tblDistrict
INNER JOIN
dbo.tblThana ON dbo.tblDistrict.DistrictNo = dbo.tblThana.DistrictNo
INNER JOIN
dbo.tblDivision ON dbo.tblDistrict.DivisionNo = dbo.tblDivision.DivisionNo
INNER JOIN
dbo.vw_EmpInfo ON dbo.tblThana.ThanaNo = dbo.vw_EmpInfo.PerThanaNo
GROUP BY
Gender, DistrictName, DivisionName, UnitEName, UnitEAddress
ORDER BY
DivisionName, DistrictName, UnitEName
This results like below:
but I want every unit's result in one single row. may be I have problem in my group by.
How should I refactor my query?

Answer 1

If you want both genders in one row, you should not group by gender.
Instead you should add up how many male and how many female there are using sum():
SELECT dbo.tblDivision.DivisionName, dbo.tblDistrict.DistrictName,
SUM(case when Gender='Male' then 1 else 0 end) as male,
SUM(case when Gender='Female' then 1 else 0 end) as female,
UnitEName
FROM dbo.tblDistrict INNER JOIN
dbo.tblThana ON dbo.tblDistrict.DistrictNo = dbo.tblThana.DistrictNo INNER JOIN
dbo.tblDivision ON dbo.tblDistrict.DivisionNo = dbo.tblDivision.DivisionNo INNER JOIN
dbo.vw_EmpInfo ON dbo.tblThana.ThanaNo = dbo.vw_EmpInfo.PerThanaNo
group by DistrictName,DivisionName,UnitEName,UnitEAddress
order by DivisionName,DistrictName,UnitEName

Answer 2

You have to leave Gender column out of the grouping clause:
SELECT dbo.tblDivision.DivisionName, dbo.tblDistrict.DistrictName,
COUNT(CASE Gender WHEN 'Male' THEN 1 END) AS male,
COUNT(CASE Gender WHEN 'female' THEN 1 END) AS female,
UnitEName
FROM dbo.tblDistrict
INNER JOIN dbo.tblThana ON dbo.tblDistrict.DistrictNo = dbo.tblThana.DistrictNo
INNER JOIN dbo.tblDivision ON dbo.tblDistrict.DivisionNo = dbo.tblDivision.DivisionNo
INNER JOIN dbo.vw_EmpInfo ON dbo.tblThana.ThanaNo = dbo.vw_EmpInfo.PerThanaNo
GROUP BY DistrictName,DivisionName,UnitEName,UnitEAddress
ORDER BY DivisionName,DistrictName,UnitEName

Answer 3

SELECT dbo.tblDivision.DivisionName
, dbo.tblDistrict.DistrictName
,COUNT(case when Gender='Male' then 1 end) as male
,COUNT(case when Gender='female' then 1 end) as female
,UnitEName
FROM dbo.tblDistrict
INNER JOIN dbo.tblThana ON dbo.tblDistrict.DistrictNo = dbo.tblThana.DistrictNo
INNER JOIN dbo.tblDivision ON dbo.tblDistrict.DivisionNo = dbo.tblDivision.DivisionNo
INNER JOIN dbo.vw_EmpInfo ON dbo.tblThana.ThanaNo = dbo.vw_EmpInfo.PerThanaNo
GROUP BY DivisionName
,DistrictName
,UnitEName

Answer 4

Remove Gender from Group by clause
SELECT dbo.tblDivision.DivisionName, dbo.tblDistrict.DistrictName,
sum (case when Gender='Male' then 1 else 0 end) as male
sum (case when Gender='female' then 1 else 0 end) as female,
UnitEName
FROM dbo.tblDistrict
INNER JOIN dbo.tblThana ON dbo.tblDistrict.DistrictNo = dbo.tblThana.DistrictNo
INNER JOIN dbo.tblDivision ON dbo.tblDistrict.DivisionNo = dbo.tblDivision.DivisionNo
INNER JOIN dbo.vw_EmpInfo ON dbo.tblThana.ThanaNo = dbo.vw_EmpInfo.PerThanaNo
GROUP BY DistrictName,DivisionName,UnitEName,UnitEAddress
ORDER BY DivisionName,DistrictName,UnitEName