Thanks Claudio.....the problem was the version (FB
Beta2), now I'm working with FB-RC1 and it's
ok......until now.

--- "Claudio Valderrama C." <cvalde@...>
escribió: > "Antonio Natividad"
<locosoft_lnx@...>

> wrote in message
>

news:20011217154622.8354.qmail@......

> >
> > SQL> create table t(a int, b int not null);
> > SQL> alter table t add constraint un_b unique(b);
> > SQL> alter table t drop constraint un_b;
> > SQL> alter table t drop b;
> >
> > SQL> alter table t add b int not null;
> > SQL> alter table t add constraint un_b unique(b);
> >
> > The error is in the 5 line (sometimes in the 6)
>
> If you are using FB, you need a new version. If you
> are using IB, I don't
> know what to suggest.
>
> C.
>
>
>
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