How to display current postion and previous position in the same row?

Question

I need to produce a promotions/transfer report that gives the employee's current position as well as his/her previous position in the same row.
for example:
Employee current position current organization current company previous postion previous organization previous company
Jane Smith Executive PA ZYX ltd Harmony personal assistant ABC ltd Yahoo
I am using the per_all_people_f, per_all_assignments_f, per_periods_of_service, hr.all_organization_units, per_all_positions tables
Somehow i cannot manage to display the previous position. I can only get so far to display the current postions
Any ideas? here is the full code
--this query gives current info
select ppf.employee_number, ppf.full_name
, (DECODE (ppf.sex, 'M', 'Male', 'F', 'Female') ) gender
, (DECODE (ppf.per_information4
,'01', 'Indian'
,'02', 'African'
,'03', 'Coloured'
,'04', 'White') ) race
, ppf.ORIGINAL_DATE_OF_HIRE
, paf.EFFECTIVE_START_DATE current_postion_start_date
, RTRIM (SUBSTR (hpt.NAME, 1, INSTR (hpt.NAME, ';') ),';')Current_Position
, ho.name Current_Organization
, xx_return_structures.xx_return_company_name
(paf.person_id,
paf.effective_start_date
) current_company
from per_all_assignments_f paf,
hr_all_positions_f_tl hpt,
hr_all_organization_units_tl ho,
per_all_people_f ppf
--where paf.person_id = 16170
and paf.POSITION_ID=hpt.POSITION_ID
and paf.ASSIGNMENT_NUMBER is not null
and ho.organization_id = paf.organization_id
and ppf.person_id=paf.person_id
and paf.EFFECTIVE_START_DATE between ppf.EFFECTIVE_START_DATE and ppf.EFFECTIVE_END_DATE
order by paf.EFFECTIVE_START_DATE
--this query gives previous position, organization and company
select ass.EFFECTIVE_START_DATE
, RTRIM (SUBSTR (hpt.NAME, 1, INSTR (hpt.NAME, ';') ),';')Previous_Position
, ho.NAME previous_organization
, xx_return_structures.xx_return_company_name
(paf.person_id,
paf.effective_start_date
) previous_company
from per_all_assignments_f paf, hr_all_positions_f_tl hpt, hr_all_organization_units_tl ho
where paf.person_id = 16170
and paf.EFFECTIVE_START_DATE not in (select max(paf.EFFECTIVE_START_DATE)
f rom per_all_assignments_f paf
where ass.person_id = 16170)
and paf.PRIMARY_FLAG ='Y'
and paf.POSITION_ID=hpt.POSITION_ID
and paf.ORGANIZATION_ID=ho.ORGANIZATION_ID

Answer 1

Ok so here is my problem. The current position display 3 times. The rest is correct. it only display once. Any ideas on how to get rid of the 2 extra rows that is being displayed with the current position?? I only need the current position to display once with the previous position info.
select distinct pvs.person_id,
peo.EMPLOYEE_NUMBER empno,
peo.FULL_NAME,
(DECODE (peo.sex, 'M', 'Male', 'F', 'Female') ) gender,
(DECODE (peo.per_information4
,'01', 'Indian'
,'02', 'African'
,'03', 'Coloured'
,'04', 'White') ) race,
peo.ORIGINAL_DATE_OF_HIRE,
pvs.EFFECTIVE_START_DATE curr_start_date,
RTRIM (SUBSTR (pvs.job, 1, INSTR (pvs.job, ';') ) ,';') current_position,
pvs.ORGANIZATION current_organization,
substr(pvs.PAYROLL,5)current_company,
a1.previous_position,
a1.previous_organisation,
a1.previous_company
from per_periods_of_work_v pv,
per_assignments_v2 pvs,
per_all_people_f peo,(select distinct RTRIM (SUBSTR (pvs.job, 1, INSTR (pvs.job, ';') ) ,';') previous_position,
pvs.ORGANIZATION previous_organisation,
substr(pvs.PAYROLL,5)previous_company,
pvs.job_id job_id,
pvs.organization_id,
pvs.position_id,
pvs.location_id,
pvs.PERSON_ID,
pvs.PEOPLE_GROUP_ID,
pvs.EFFECTIVE_END_DATE,
pvs.EFFECTIVE_START_DATE
from per_assignments_v2 pvs
where sysdate > pvs.EFFECTIVE_END_DATE
and pvs.person_id=4723
)a1
where peo.person_id = pvs.person_id
and pvs.person_id = pv.person_id
and a1.person_id = pvs.person_id
and pvs.EFFECTIVE_START_DATE between peo.EFFECTIVE_START_DATE and peo.EFFECTIVE_END_DATE
and pvs.PEOPLE_GROUP_ID <> a1.people_group_id
and pvs.JOB_ID <> a1.job_id
and pvs.ORGANIZATION_ID <> a1.organization_id
and pvs.position_id <> a1.position_id                     activating this elimnates 1-Feb-2008 info
and pvs.effective_start_date -1 = a1.effective_end_date     activating this eliminates 1-feb-2008, 1-jul-2006, 1-april-1996 info
and pv.person_id = 4723
order by pvs.effective_start_date desc