INSERT INTO mens values
(Mensagem('oi','aeeeeeeeeeee'));

insert into table(select u.mens
 from Usuarios u
 where u.login like 'laon')
 Values((select ref(m)
 from mens m
 where m.titulo = 'oi'));

insert into Usuarios values
(Usuario('Beto','laon', '111',posMens_nested(),posComp_nested(), posAmigo_nested(), posProf_nested(), posfam_nested()));

select l.ref_disc.nome,c.nome,l.qtde
from curso c, the(select lista_membro
from curso c1
where c1.num_curso = c.num_curso) l
where l.ref_al.Mat = 2;

select m.ref_mens.descricao 
from Usuarios u, the(select mens
from Usuarios u1
where u1.login like 'laon') m
where m.ref_mens.titulo like 'oi';

select m.ref_mens.descricao 
from Usuarios u, the(select mens
from Usuarios u1
where u1.login like 'lino') m;