On Thu, Jun 02, 2005 at 14:08:54 +0200,
  KÖPFERL Robert <[EMAIL PROTECTED]> 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.

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