Marinos Yannikos wrote:
> (btw.: I'm trying a few ways to ensure that all values in both t1 and t2
> are unique:
> alter table blup add constraint check (blup_unique3(t1,t2));
> - perhaps there are more elegant ways, any suggestions?)
>
No doubt someone will tell me this is Very Wrong:
create table blup_text(txt text primary key);
create table blup (t1 text references blup_text(txt), t2 text references blup_text(txt));
You may want to add NOT NULL conditions to t1, t2.
If your text values are long, this may be a good place to use synthetic
keys - e.g.
create table blup_text(id serial primary key, txt text unique);
create table blup(t1 integer references blup_text(id), t2 integer references blub_text(id));
--
Edmund Bacon <ebacon@onesystem.com>