Getting the last/latest record based on status, if not on date

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SQL-Server-2008R2

Hi. I am having difficulty getting the last/latest record from table.

These are the structure of the tables

[TABLE RESULT]

I need to place it in the subquery.

SQL

select EmployeeNo
,(Select PosCode from EmploymentHistory where EmployeeNo=EmpPersonalInfo.EmployeeNo) as PositionCode
,(Select Rate from EmployeeSalaryHistory where EmployeeCode=EmpPersonalInfo.EmployeeNo) as PositionCode
from  EmpPersonalInfo where EmployeeCode=902575

I can distinguish the latest record in both records if Status=1, what if status=0 for all the records in the table, how can I get the latest record (it depends on the effectivitydatefrom- for EmploymentHistory table, and EffectivityDate -for EmployeeSalaryHistory)

Aside from getting TOP 1 and ORDER BY DESC, is there anyway to do this in most suggested way?

What I have tried:

I tried the codes above but i am seeking for additional information.

AND I TRIED THIS, but i cant build the logic, can I manipulate it here?

select EmpPersonalInfo.LastName,EmpPersonalInfo.FirstName,EmpPersonalInfo.MiddleName,EmpPersonalInfo.MI,
EmploymentInfo.Street,EmploymentInfo.District,EmploymentInfo.City,EmploymentInfo.Country,EmploymentInfo.ZipCode
,position.PosTitle,tblEmployeeMainInfo.BranchCode,EmpDepartment.Department,tblEmployeeMainInfo.DivisionCode
,tblEmployeeMainInfo.AssignmentCode,EmploymentInfo.HireDate
,EmployeeSalaryHistory.EffectivityDate,EmployeeSalaryHistory.Rate
,EmployeeSalaryHistory.RateType,EmployeeSalaryHistory.Active as SalaryStatus,
EmploymentHistory.EffectivityDateFrom,EmploymentHistory.EffectivityDateTo,
EmploymentHistory.Status as EmploymentStatus
from EmpPersonalInfo LEFT JOIN EmploymentHistory ON EmpPersonalInfo.EmployeeNo=EmploymentHistory.EmployeeNo
LEFT JOIN EmployeeSalaryHistory ON EmpPersonalInfo.EmployeeNo = EmployeeSalaryHistory.EmployeeCode
LEFT JOIN tblEmployeeMainInfo ON tblEmployeeMainInfo.EmployeeCode=EmpPersonalInfo.EmployeeNo
LEFT JOIN EmploymentInfo on EmpPersonalInfo.EmployeeNo=EmploymentInfo.EmployeeNo
LEFT JOIN Position ON Position.PoCode = EmploymentHistory.PosCode
LEFT JOIN EmpDepartment on EmpDepartment.DeptID = EmploymentHistory.DepartmentID
where EmpPersonalInfo.EmployeeNo=902575

Posted 16-Feb-16 15:51pm

bjay tiamsic

Updated 16-Feb-16 16:11pm

v2

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Tomas Takac · Answer 1 · 2016-02-16T22:31:00

There is a way, you can asssign a sequence number using a ranking functions and then filter on that:

SQL

with EmploymentHistoryEx AS
(
    Select EmployeeNo, PosCode, Status, EffectivityDateFrom, EffectivityDateTo
        row_number() over(partition by EmployeeNo order by Status desc, EffectivityDateFrom desc) as HistorySeq
    from EmploymentHistory
)

You do the same for the other table. Then in your main query you join to the first record:

SQL

select 
    ...
    EmploymentHistoryEx.EffectivityDateFrom,
    EmploymentHistoryEx.EffectivityDateTo,
    EmploymentHistoryEx.Status as EmploymentStatus
    
from 
    EmpPersonalInfo 
    LEFT JOIN EmploymentHistoryEx 
        ON EmpPersonalInfo.EmployeeNo=EmploymentHistoryEx.EmployeeNo
        AND EmploymentHistoryEx.HistorySeq=1 
    ...
where EmpPersonalInfo.EmployeeNo=902575