How to carry out Yii role based access control when multiples tables are involved

[RobertTA]

I am now trying to develop a website under the Yii framework and Role-Based Access Control(RBAC) is needed in the program. I read from the guide that filter can be used for RBAC, but I wonder what should I do if the administrators and users are store in two tables? Namely if there are two tables in the database, one for admins and on for users, how should I implemented access control? Thank you.