Is it possible to do the following step in 1 .SQL file?
create a new role
login as the new role
alter role
Switch user in a .SQL for postgresql
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In PostgreSQL, executing all those steps in one single .sql file, isn't directly possible due to how session authentication and role switching work. When you connect to a PostgreSQL database, you authenticate as a specific user for the duration of that connection. You can't change the authenticated user mid-session directly using standard SQL commands.