Oracle 11g sql to find difference from two table data

I have two tables ACTUAL AND ESTIMATE having unique column(sal_id, gal_id) and amount, tax, date columns.
ACTUAL table
actual_id, sal_id, gal_id, process_flag, amount, tax date
A1 101 201 Y 10 1 27-Aug-12
A2 102 202 Y 20 2 27-Aug-12
A3 102 202 N 30 3 29-Aug-12
A4 302 402 N 40 3 30-Aug-12
ESTIMATE table
estimate_id, sal_id, gal_id, process_flag, amount, tax date
E1 301 401 Y 5 1 19-Aug-12
E2 302 402 Y 45 4 20-Aug-12
E3 302 402 Y 50 5 25-Aug-12
E4 301 403 Y 10 2 27-Aug-12
E5 301 403 N 15 3 28-Aug-12
E6 101 201 Y 12 3 29-Aug-12
Now My FINAL table, 1) Should have record for unprocessed (process_flag='N') from ACTUAL/ESTIMATE table for difference in amount and tax for (sal_id + gal_id) combination. If more than one processed record there, then max (date) should be consider.
FINAL table
actual_id, estimate_id, sal_id, gal_id, amount, tax
A3 null 102 202 10 1 (A3-A2 actual-actual)
A4 null 302 402 -10 -2 (A4-E3 actual-estimate with max date)
null E5 301 403 5 1 (E5-E4 estimate-estimate)
null E6 101 201 2 2 (E6-A1 estimate-actual)
So basically I need a query for (A-A) U (B-B) U (A-B) U (B-A).
I am using Oracle 11g Please help me.
Edited by: Suresh on Aug 31, 2012 7:38 PM
Edited by: Suresh on Aug 31, 2012 7:38 PM
Edited by: Suresh on Aug 31, 2012 10:53 PM

You need to provide better explanation here.A-A is always null.
You might be looking for something like this..
Untested version and also i cannot read your mind
select actual_id, sal_id, gal_id, process_flag,ld_amount,ld_tax,e_date
from(
select actual_id, sal_id, gal_id, process_flag,e_date, amount-lead(amount) over(partition by sal_id, gal_id order by e_date desc) ld_amount,
tax-lead(tax) over(partition by sal_id, gal_id order by e_date desc) ld_tax,
rank() over(partition by sal_id, gal_id order by e_date desc)rnk
from
(select * from actual a union
select * from estmt e)
) where rnk=1

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select *
    from card
   where pin_number = p_pin_number;
cursor c2 is
select *
    from student_details
   where exam_number = p_exam_number;
begin
open c1;
    loop
      fetch c1 into r_card_row;
      exit when c1%notfound;
      .... do whatever you want..... and the samething you can do with other cursor
    end loop;
close c1;
end p1;Hope this helps
Ghulam

Oracle 11g sql to find difference from two table data

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