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Dúvida com consulta SQL


Dieguinn

Question

http://imageshack.us/photo/my-images/18/imagemjuo.jpg

Qual é o resultado dessa consulta, considerado essas tabelas mostradas acima na imagem ? Poderiam me explicar por gentileza?

select Nome
from Passageiros
where Cruzeiro in (
select distinct t1.Codigo
from Cruzeiros t1, Cruzeiros t2
where t1.Origem = t2.Origem
and t1.Codigo <> t2.Codigo)
order by Nome asc;

Muito obrigado !!!

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