Change duplicate value in a column

Question

Can you please tell me what SQL query can I use to change duplicates in one column of my table? I found these duplicates:

SELECT Model, count(*) FROM Devices GROUP BY model HAVING count(*) > 1;

I was looking for information on exactly how to change one of the duplicate values, but unfortunately I did not find a specific option for myself, and all the more information is all in abundance filled by deleting the duplicate value line, which I don't need. Not strong in SQL at all. I ask for help. Thank you so much.

Answer 1

After the command:

SELECT Model, count (*) FROM Devices GROUP BY model HAVING count (*)> 1;

i get the result:

• 1895 lines = NULL;
• 3383 lines with duplicate values;
• and all these values are 1243.

after applying your command:

update Devices set
  Model = '-'
where id not in
  (select
     min(Devices .id)
   from Devices 
   group by Devices.Model)

i got 4035 lines changed. if you count, it turns out, (3383 + 1895) = 5278 - 1243 = 4035 and it seems like everything fits together, the result suits, it works.