On Sun, 2003-07-13 at 10:17, nolan@celery.tssi.com wrote:
> > I understand that SQL is the interface between apps and RDBMS's because
> > of history, not because it is correct design. Could you point me to a
> > link or book or paper that deals with this paradox? Thanks!
>
> I'm not sure what you mean by 'correct design'.
>
> I think you should go back and read the works of Codd and Date on the
> development of relational databases. One point that was made early on is
> that RDBMS theory doesn't guarantee efficiency, but it does guarantee
SQL is only one possible relational query language. It didn't
become de facto standard until the mid- to late-80s.
It is an outgrowth of SEQEL (Structured English QuEry Language),
which was IBM's 1st try at a descriptive query language. DEC
had RDML (Relational Data Manipulation Language) to access it's
RDBMS. I'm sure that Burroughs, etc, had their own access methods,
too.
--
+-----------------------------------------------------------+
| Ron Johnson, Jr. Home: ron.l.johnson@cox.net |
| Jefferson, LA USA http://members.cox.net/ron.l.johnson |
| |
| 4 degrees from Vladimir Putin
+-----------------------------------------------------------+