You have generated the demo data for the SQL Tutorial.
Log on to the demo database instance DEMODB as user MONA.
Define and use roles. Proceed as described in SQL Tutorial, Roles.
You can use the system table ROLES to determine the following database information, among other things:
? All roles for which it is necessary to enter a password to activate them
SELECT owner, role
WHERE password_required = 'YES'
? Role of the current user that is automatically activated when a database session is opened
WHERE defaultrole = 'YES'
All roles that are active in the current database session: see SESSION_ROLES
Role privilege: see ROLEPRIVILEGES