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1. SELECT ra FROM HISTORICO WHERE cod_disc='BD' AND ano=2015 AND nota <5 2. SELECT a.RA, a.NOME, a.NOME from HISTORICO h, ALUNOS a where cod_disc='BD' and ano=2015 and nota <5 and a.RA=h.RA 3. SELECT distinct(p.NOME) from PROFESSORES p, TURMA t where p.COD_PROF=t.COD_PROF and t.ANO=2015 and t.COD_DISC='BD'
