I have created a login and database user called "MYDOMAIN\Domain Users". I need to find what roles a logged on domain user has but all the calls to get the current user return the domain username eg. "MYDOMAIN\username" not the database username eg. "MYDOMAIN\Domain Users".

For example, this query returns "MYDOMAIN\username"

select original_login(),suser_name(), suser_sname(), system_user, session_user,  current_user, user_name()

And this query returns 0

select USER_ID()

I want the username to query database_role_members is there any fuction that will return it or any other way I can get the current users roles?