title: PostgreSQL : Transaction and foreign key problem
body: <p>I'm inserting a value in table A, that has a serial type as primary key. I wanna use the returned value of the query as a foreign key of table B... but I get this message:</p>
  
  <p><em>ERROR: insert or update on table "tb_midia_pessoa" violates foreign key constraint "tb_midia_pessoa_id_pessoa_fkey" DETAIL: Key (id_pessoa)=(30) is not present in table "tb_pessoa". )</em> </p>
  
  <p>How can I make this possible without:
  - starting a new Transaction
  - droping my foreign keys constraints =O 
  ?</p>
  
  <p>Regards!
  Pedro</p>