Convert multiple rows to columns but as one rows - sql

Question

How do i achieve achieve all this records under one row since every employee has one of each NHIF, NSSF and KRA number?
Below is the query i used but the all appear separate rows.
SELECT DISTINCT
hrmemployeehdr.employeeslno,
hrmemployeehdr.employeecode,
hrmemployeehdr.employeefirstname,
hrmemployeehdr.employeemiddlename,
hrmemployeehdr.employeelastname,
hrmDesignationHdr.DesignationName,
hrmemployeehdr.DateOfBirth,
hrmemployeehdr.DateOfJoin,
hlocationhdr.locationname,
hrmEmployeeIdentityDtl.IDProofReferenceNo AS [National ID],
(CASE
WHEN hrmEmployeeDeductionSettingsDtl.DeductionCode = 1 THEN hrmEmployeeDeductionSettingsDtl.EmployeeRegID
ELSE ''
END) AS NHIF,
(CASE
WHEN hrmEmployeeDeductionSettingsDtl.DeductionCode = 2 THEN hrmEmployeeDeductionSettingsDtl.EmployeeRegID
ELSE ''
END) AS NSSF,
(CASE
WHEN hrmEmployeeDeductionSettingsDtl.DeductionCode = 3 THEN hrmEmployeeDeductionSettingsDtl.EmployeeRegID
ELSE ''
END) AS KRA,
hrmemployeestatusdtl.Email AS [Employee Email],
huser.email AS [User Account Email],
hrmEmployeeGradeHdr.GradeName,
hDepartment.DepartmentName
FROM hrmemployeehdr
JOIN hrmemployeestatusdtl ON hrmemployeestatusdtl.employeeslno = hrmemployeehdr.employeeslno
JOIN hdivision ON hdivision.divisioncode = hrmemployeestatusdtl.divisioncode
JOIN hlocationhdr ON hlocationhdr.locationcode = hrmemployeestatusdtl.workinglocationcode
JOIN hDepartment ON hDepartment.DepartmentCode = hrmemployeestatusdtl.DepartmentCode
JOIN hrmDesignationHdr ON hrmDesignationHdr.DesignationCode = hrmemployeestatusdtl.DesignationCode
JOIN hrmEmployeeCategoryHdr ON hrmEmployeeCategoryHdr.CategoryCode = hrmemployeestatusdtl.CategoryCode
JOIN hrmEmployeeGradeHdr ON hrmEmployeeGradeHdr.GradeCode = hrmemployeestatusdtl.GradeCode
LEFT JOIN huser ON huser.employeeslno = hrmemployeehdr.employeeslno
JOIN hMasterValue ON hMasterValue.MasterValueID = hrmemployeestatusdtl.MasterValue_EmploymentStatusID
JOIN hrmEmployeeIdentityDtl ON hrmEmployeeIdentityDtl.EmployeeSlno = hrmemployeehdr.EmployeeSlno
INNER JOIN hMasterValue a ON a.MasterValueID = hrmEmployeeIdentityDtl.MasterValue_IDProofTypeID
INNER JOIN hrmEmployeeDeductionSettingsDtl ON hrmEmployeeDeductionSettingsDtl.EmployeeSlno = hrmemployeehdr.EmployeeSlno
LEFT JOIN hrmDeductionHdr ON hrmDeductionHdr.DeductionCode = hrmEmployeeDeductionSettingsDtl.DeductionCode
WHERE hrmemployeestatusdtl.employeeslno NOT IN (SELECT hrmemploymentstoppageandtermination.employeeslno
FROM hrmemploymentstoppageandtermination)
AND hrmEmployeeIdentityDtl.MasterValue_IDProofTypeID = 2741005
--and hrmemployeestatusdtl.email = huser.email
--and huser.isemployee = 1
-- select * from huser
ORDER BY employeefirstname ASC;

Answer 1

Use conditional aggregation on the detail table to condense all those rows into one for each employee. Something like:
with edet as (select employeeslno,
max(CASE DeductionCode when 1 THEN EmployeeRegID ELSE '' END) AS NHIF,
max(CASE DeductionCode when 2 THEN EmployeeRegID ELSE '' END) AS NSSF,
max(CASE DeductionCode when 3 THEN EmployeeRegID ELSE '' END) AS KRA
from dbo.hrmEmployeeDeductionSettingsDtl
group by employeeslno)
select emp.employeeslno, ...,
edet.NHIF, edet.NSSF, edet.KRA, ...
from dbo.hrmemployeehdr as emp
inner join edet on emp.employeeslno = edet.employeeslno
...
order by ...
;
Notice the formatting changes that HELP everyone read and understand the code as well as the good habits of using aliases, schema-qualified table names, statement terminator, etc. As already mentioned, the other joins might be contributing to the problem - but this addresses the 1:3 relationship between the header and detail table.