SQL output rendering renamed duplicate entries - mysql

Question

I have a table with data similar to the following:
id p_id process
300 1 initial
300 2 stage_beta
300 3 conversion
300 4 render
300 5 stage_beta
300 6 conversion
300 7 render
300 8 finish
I would like to generate a SQL query such that my output would modify the duplicate process as a new process.
id p_id process
300 1 initial
300 2 stage_beta
300 3 conversion
300 4 render
300 5 stage_beta_new
300 6 conversion_new
300 7 render_new
300 8 finish
I have tried using variations on the following join, but I am missing something:
SELECT id,
process,
process_id
FROM process_view
JOIN (SELECT id,
process_id,
(CASE WHEN process = "stage_beta" then "stage_beta_new"
WHEN process = "conversion" then "conversion_new"
WHEN process = "render" then "render_new"
ELSE name
END) as name
FROM process_view) AS process2 on process.id = process2.id
The end result just renames all of the fields, but does not retain the initial process or allow for if the process repeats a third time.
Any suggestions or recommendations would be greatly appreciated.

Answer 1

First assign an number to each repeated process:
SELECT id, p_id, process,
row_number() over (partition by id, process order by p_id) as rn
FROM YourTable
Now you can assign new to all beside the first one, or assign the number:
SELECT id, p_id,
CASE WHEN rn > 1
THEN CONCAT(process, '_new')
ELSE process
END as process,
CONCAT(process, '_' , rn) as process2
FROM (
SELECT id, p_id, process,
row_number() over (partition by id, process order by p_id) as rn
FROM YourTable
)

Answer 2

You could use a window function as
SELECT *,
CASE WHEN ROW_NUMBER() OVER(PARTITION BY ID, Process ORDER BY ID) = 1
THEN Process
ELSE CONCAT(Process, '_new') END
FROM YourTable

Answer 3

With EXISTS:
select p.id, p.p_id,
concat(
p.process,
case
when exists (
select 1 from process_view
where id = p.id and process = p.process and p_id < p.p_id
) then '_new'
else ''
end
) process
from process_view p
See the demo.
Results:
| id | p_id | process |
| --- | ---- | -------------- |
| 300 | 1 | initial |
| 300 | 2 | stage_beta |
| 300 | 3 | conversion |
| 300 | 4 | render |
| 300 | 5 | stage_beta_new |
| 300 | 6 | conversion_new |
| 300 | 7 | render_new |
| 300 | 8 | finish |