Thank you very much, I think I need to stady more about trigger.
2009/9/28 A. Kretschmer
> In response to ? :
> > Yes, you are right. That maybe a bad example. what I want to say maybe
> like
> > this:
> >
> > create table a (
> > id integer,
> > room varchar(32),
> >
In response to ? :
> Yes, you are right. That maybe a bad example. what I want to say maybe like
> this:
>
> create table a (
> id integer,
> room varchar(32),
> start time,
> end time,
> PRIMARY KEY(id)
> )
> How can I check if it is the same r
In response to ? :
> create table a(
> name varchar(32);
> );
>
> create talbe b(
> name1 varchar(32);
> name2 varchar(32);
> );
>
>
> How to write a constraint to check name1, name2 in the table a without change
> table defination?
-- Okay, your tables with
create table a(
name varchar(32);
);
create talbe b(
name1 varchar(32);
name2 varchar(32);
);
How to write a constraint to check name1, name2 in the table a without
change table defination?
ALTER TABLE b ADD CHECK( ??? );
