Re: Update "usename" in pg_user

On Tue, 2023-11-14 at 13:20 +0000, Bernd Lentes wrote:
> >
> > ALTER USER <username> RENAME TO <new_username> is what you want
>
> thanks. Can I do this for all users in one turn ?

You can use the psql client and run

  SELECT format('ALTER ROLE %I rename to %I',
                usename,
                usename || 'helmholtz-munich.de')
  FROM pg_user
  WHERE usename <> 'postgres' \gexec

\gexec will automatically execute each result line as an SQL statement.

Yours,
Laurenz Albe