Update values based on sequence of rows - Oracle SQL - sql

Question

I have a table:
table1
u_a_id d_c_s c_nm c_v c_se line_num
19 878 Test Code - Individual CO 1 30
19 878 Test Code - Individual PR 1 31
19 878 Test Code - Individual PR 2 32
19 878 Test Code - Individual CO 2 33
19 878 Test Code - Individual CO 1 33
19 878 Test Code - Individual PR 1 34
19 878 Test Code - Individual PR 2 35
19 878 Test Code - Individual CO 2 36
19 878 Test Code - Individual PR 3 37
19 878 Test Code - Individual CO 3 38
For each u_a_id, order by line_num, I need to identify if combination of c_nm and c_se is repeated. If the combination is repeated, then I need to update the following based on the sequence:
d_c_s to 12000 for First
d_c_s to 12001 for Second
d_c_s to 12002 for Third
Append First to c_nm
Append Second to c_nm
Append Third to c_nm
The output would look like:
u_a_id d_c_s c_nm c_v c_se line_num
19 12000 Test Code, First - Individual CO 1 30
19 12001 Test Code, Second - Individual PR 1 31
19 12000 Test Code, First - Individual PR 2 32
19 12001 Test Code, Second - Individual CO 2 33
19 12000 Test Code, First - Individual CO 1 33
19 12001 Test Code, Second - Individual PR 1 34
19 12000 Test Code, First - Individual PR 2 35
19 12001 Test Code, Second - Individual CO 2 36
19 12000 Test Code, First - Individual PR 3 37
19 12001 Test Code, Second - Individual CO 3 38
Is there anyway in SQL to do it?

Answer 1

What you describe is more like this:
select . . .,
(12000 - 1 + seqnum) as d_c_s,
replace(c_nm, ' - ',
(case seqnum
when 1 then ', First - '
when 2 then ', Second - '
when 3 then ', Third - '
else ' - '
end)
) as c_nm
from (select t.*,
row_number() over (partition by c_nm, c_se order by line_num) as seqnum,
count(*) over (partition by c_nm, c_se) as cnt
from t
) t