Query with almost the same query as a subquery, can it be optimized?

I have a query using almost a duplicate of itself (table 1) as a subquery, and I wonder if it can be rewritten better, like she just doesn't seem the right way to do it, but everything I try I can't get the same number of lines back.

If anyone can see a better way, it would be a great help.

Thank you very much
SELECT t.pol_number||t.check_digit
FROM   transactions t, policies p, funds f
WHERE f.fnd_code = t.trn_fnd_code
AND     t.trn_pol_number = p.pol_number
AND     p.pol_status IN (1,2)
AND     t.trn_status = 'NEW'
AND     t.trn_trn_number IN
   (SELECT t2.trn_trn_number
    FROM   transactions t2, policies p2
    WHERE t2.trn_pol_number = p2.pol_number 
    AND     p2.pol_status IN (1,2)
    AND     t2.trn_status = 'NEW'
    AND     t2.trn_fnd_code = :PARAMETER)
Surely it is not the best way to write it as you use the same table twice and restrictions?

Published by: Scott Hillier on March 16, 2010 15:11

It looks like you want all the lines of the siblings who do not personally meet the restriction on trn_fnd_code. You can use analytical functions;

not tested

select *
  from (select pol_number || check_digit col1,
               max(case
                      when t.trn_fnd_code = :parameter then
                       1
                      else
                       0
                    end) over(partition by trn_trn_number) max_trn_number
          from transactions t, policies p, funds f
         where f.fnd_code = t.trn_fnd_code
           and p.pol_status in (1, 2)
           and t.trn_status = 'NEW')
 where max_trn_number = 1;

Tags: Database

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