Can the query be tuned to make it run faster?

Question

select distinct
A.DEPTID,
A.POSITION_NBR,
A.EMPLID,
A.EMPL_RCD_NBR,
A.EFFDT,
B.NAME,
A.EMPL_STATUS,
A.JOBCODE,
A.ANNUAL_RT,
A.STD_HOURS,
A.PRIMARY_JOB,
C.POSN_STATUS,
case when A.POSITION_NBR = ' ' then 0 else C.STD_HOURS end,
case when A.POSITION_NBR = ' ' then ' ' else C.DEPTID end
from PS_JOB A,
PS_PERSONAL_DATA B,
PS_POSITION_DATA C
where A.EMPLID = B.EMPLID
and
((A.POSITION_NBR = C.POSITION_NBR
and A.EFFSEQ = (select max(D.EFFSEQ)
from PS_JOB D
where D.EMPLID = A.EMPLID
and D.EMPL_RCD_NBR = A.EMPL_RCD_NBR
and D.EFFDT = A.EFFDT)
and C.POSN_STATUS <> 'G'
and C.EFFDT = (select max(E.EFFDT)
from PS_POSITION_DATA E
where E.POSITION_NBR = A.POSITION_NBR
and E.EFFDT <= A.EFFDT)
and C.EFFSEQ = (select max(F.EFFSEQ)
from PS_POSITION_DATA F
where F.POSITION_NBR = A.POSITION_NBR
and F.EFFDT = C.EFFDT))
or
(A.POSITION_NBR = C.POSITION_NBR
and A.EFFDT = (select max(D.EFFDT)
from PS_JOB D
where D.EMPLID = A.EMPLID
and D.EMPL_RCD_NBR = A.EMPL_RCD_NBR
and D.EFFDT <= C.EFFDT)
and A.EFFSEQ = (select max(E.EFFSEQ)
from PS_JOB E
where E.EMPLID = A.EMPLID
and E.EMPL_RCD_NBR = A.EMPL_RCD_NBR
and E.EFFDT = A.EFFDT)
and C.POSN_STATUS <> 'G'
and C.EFFSEQ = (select max(F.EFFSEQ)
from PS_POSITION_DATA F
where F.POSITION_NBR = A.POSITION_NBR
and F.EFFDT = C.EFFDT)))
or
(A.POSITION_NBR = ' '
and A.EFFSEQ = (select max(D.EFFSEQ)
from PS_JOB D
where D.EMPLID = A.EMPLID
and D.EMPL_RCD_NBR = A.EMPL_RCD_NBR
and D.EFFDT = A.EFFDT))

Answer 1

Repost... I'll put in the same valuable reply that Blu made last time....
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