SELECT provas.id, disciplinas.disciplina, disciplinas.grupo,salas.sala
FROM provas, disciplinas, horarios, salas
WHERE provas.id = provas.id AND provas.id_disciplina = disciplinas.id AND provas.id_horario = horarios.id AND provas.id_sala = salas.id AND provas.id_horario JOIN horarios ON ;

SELECT dias.dia, meses.nome, horas.hora, minutos.minuto
FROM horarios, meses, dias, horas, minutos
WHERE horarios.id = horarios.id AND horarios.id_dia = dias.id AND horarios.id_hora = horas.id AND horarios.id_mes = meses.id AND horarios.id_minuto = minutos.id;