Re: RM VERY STRONG SUGGESTION 4: TRANSITION CONSTRAINTS
Date: Sat, 4 Sep 2010 04:06:51 -0700 (PDT)
Message-ID: <7ea49c92-82ac-4096-9146-afc0556a7af7_at_z7g2000yqg.googlegroups.com>
> That is not entirely untrue, because of the CWA. A tuple represents a
> proposition that is believed to be true in the microworld modeled by
> the database in which the tuple appears. Applying the CWA to
> determine whether some tuple should or should not appear in the
> database, cannot possibly be done by the DBMS, and is therefore the
> exclusive responsibility of the user. So while such a mapping can
> indeed be perceived to exist, it is by definition of no use to the
> DBMS and it is therefore a mistake to let the DBMS be bothered with
> such mapping.
To which I should add that, since this is a forum where database therory, thus DBMS technology, is discussed, it is indeed valid to say that such a mapping does not exist, because its existence does not make any difference to the DBMS anyhow. Received on Sat Sep 04 2010 - 13:06:51 CEST