17 de mayo JZJ <3

select * from marineros inner join reservas on marineros.mid=reservas.mid ;

select * from marineros inner join reservas on marineros.mid=reservas.mid where reserva>'2000-01-01';

marinerosMenoresque(edad)



create or replace function marineroMenorque(edadM int) returns  record as $$

declare
    menores record;

begin
    select * into menores from marineros where marineros.edad<edadM ;
    return menores;
end;

$$ language plpgsql;

-------------------------------------------********------------------------------------------
create function trigger() returns trigger as $$
declare
   variable tipo1;
  variablew tipow;