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Are you sure it’s cross Join you need? cross Join makes no connection between the tables. And you have the links. Try this query:
select f.id_filme, f.nome_filme, a.id_ator, a.nome_ator
from tb_filme f join tb_ator_filme af
on (f.id_filme=af.id_filme)
join tb_ator a
on (a.id_ator = af.id_ator)
Ps: I don’t have now with me BD to test, but I think it does what it needs