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Insert com primary key e character varying


Estou tentando fazer um INSERT em um banco PostgreSQL, no qual um dos campos é primary key e character varying. 
Existe alguma função que eu posso utilizar para preencher esse campo automaticamente?

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Preenchimento automático existe para chave numérica, bastando definí-la com "serial". Para "varchar" não dá para adivinhar a próxima chave, né?!?!

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