Pl/sql select distinct in a where clause

Question

Greedings,
I am trying to execute some kind of distinct using rowid in where clause but for some reason im not getting the appropriate result. Any guidance is welcome
SELECT acnt_code,cat,cat_desc,buc FROM so_budgets_cat where
Trim(buc)='S03'
and
NOT exists (SELECT  1
                   from   so_budgets_cat tab2
                   where  (  tab2.cat     =  so_budgets_cat.cat )
                   and    tab2.ROWID  > so_budgets_cat.ROWID
ORDER BY cat,so_budgets_cat.rowidThanks in advance

Answer 1

Can you provide some example data and example output to further clarify?
It might be that you want something like the code below, but it's hard to tell.
SELECT acnt_code
,      cat
,      cat_desc
,      buc
FROM
(SELECT acnt_code
,      cat
,      cat_desc
,      buc
,      ROW_NUMBER() OVER (PARTITION BY cat ORDER BY <something>) rn
FROM   so_budgets_cat
WHERE  Trim(buc)='S03')
WHERE rn = 1;