Thanks for the answers, I have tried those commands within the nextcloud folder after changing directory permissions and I’m getting this response.
"Nextcloud is not installed - only a limited number of commands are available
There are no commands defined in the “db” namespace."
As stated in my first post, I stopped at the first greeting page of NC asking to create an admin account, thinking it would be easier to modify the database before going further.
Is it easier to complete the admin creation and transform the database or can someone explain how to create the initial database with MariaDB/MySQL but not SQLite?