[SQLObject] Three tables relations.

[Juampi <jpf...@gm...>]

Hello, I need a n:mn table to relate three tables like Person, Roll, Group.
 CREATE TABLE Person_Group {
     id_person
     id_group
     id_roll
      UNIQUE (id_person,id_group)
}
 I don=B4t know the best way to represent this relation (I don=B4t speak
english either, but i read it very well)
Many Thanks!!!