On Thu, Jun 02, 2005 at 14:08:54 +0200,
KÖPFERL Robert <robert.koepferl@sonorys.at> wrote:
> To me it seems that the definer of this table missed the concept index ...
> or the concept database
> One usually looks up data using a key, but if the whole row is the key, what
> data shall be looked up.
You sometimes do want to make a whole role a key to avoid duplicate keys.
A common case is when you use a table to connect two other tables with
a many to many relation.
It would be rare to want to do that with large text values though.