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many to many tables


jc2006

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Hi

I have the following situation: 

          user
            |m
            |
            |m
car ----------wax
      m          m 

The user has a many to many relationship to the "many to many relationship" of car and wax. 

I have tables of car, wax and user.  I have a car_to_wax table that shows which waxes can be used for a given car.  Is it possible to create another table, a user_car_wax table, that shows which waxes the user has actually used for certain cars?  Wouldn't this entail a table with three primary keys?  Is there another solution? 

Thanks a bunch in advance.


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