How Many Routing Tables

Dear Friends,

This may be a silly question but I never found a clear answer form a book or
a standard. 

A router is running BGP4, OSPF and RIP at the same time. How many routing
tables(or forwarding tables) this router has? I think there should be only
one table produced by all the protocols and used by the router to route
every packet through the router, but I am not sure. Can somebody help get an
answer ?

Thank you very much
David