display data from previous rows

Hi
To recap what you have I listed some assumptions

Service date:
this is typically the hire_date, if a person is terminated
and rehired within 12 months then its Service date is retained
but if a person is rehired after 12 months of termination then its rehire_date is the Service_date


service_date1 = hire_date
service_date2 = hire_date when rehired within 12 months
service_date3 = hire_date2 (re_hire_date) when rehired after 12 months


term service date:
if a person is rehired after 12 months of termination
then its previous hire date is the term service date

term_date1 = term_date
term_date2 = hire_date  when rehired after 12 months (the hire date would of been the previous hire date)

you can then write sql like, the test1 table is just a table i created to test the results, but you would want to replace that with the actual table. If the sql looks good, then I would suggest you create this as a view

select a.*
, case hire_code
      when 'REHIRE' then
            case when (add_months(a.term_date, 12) < a.hire_date2)
                        then hire_date -- this is the original hire_date
                        else hire_date2 -- this is the re-hire_date
                        end
      else
            hire_date -- this is the original hire_date
      end   SERVICE_DATE
, case hire_code
      when 'REHIRE' then
            case when (add_months(a.term_date, 12) < a.hire_date2)
                        then cast(NULL as date)
                        else hire_date -- this is the previous hire_date
                        end
      else
            term_date -- this is the original term_date
      end   term_date2  
from test1 a
;

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