Read Group-Attribute from mysql

I want to read the Group-Attribute from a mysql-database without having all users in the mysql-database. Users not in mysql should have group := default others group:= from mysql-table. Is that possible. Do you have some hints. I am using freeradius 1.0.4 Grüße Hans-Peter Fuchs Hans-Peter Fuchs - RZKR, Zimmer 20 Zentrum fuer angewandte Informatik - Universitaetsweiter Service RRZK Universität zu Köln - Tel: 0221-470-6972