How to select distinct rows ..?

Hi all...
I am having one table with many columns. I want to select distinct rows from one column and for each row selected, i want to have one unique number.
For ex:
SELECT DISTINCT SUM(ROWNUM) OVER(ORDER BY C.SPECIFICATION NULLS LAST) AS CODE,
C.SPECIFICATION FROM TABLE_1 C WHERE condition.
In this case, there is a chance of getting duplicate values (1 and 4 rows selected = total 5) and (3 and 2 rows selected = total 5)
i thought of selecting through sub query like this
select rownum, code from (select distinct SPECIFICATION as code from table where ...)
Is there anymore options to get the desired output.
Thanks in advance,
Pal

try like this:
select distinct
dense_rank() over(order by c.specification) as code,
c.specification
from table_1 c
where condition

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