Re: 4 the FAQ: Are Commercial DBMS Truly Relational?

From: Marshall Spight <mspight_at_dnai.com>
Date: Sun, 10 Oct 2004 17:41:35 GMT
Message-ID: <jvead.367112$Fg5.54238@attbi_s53>

"Kenneth Downs" <firstinit.lastname_at_lastnameplusfam.net> wrote in message news:qirbkc.3c8.ln_at_mercury.downsfam.net...

> To get a TRDMS, (or a TRDMS query language), do we unconditionally do the
> equivalent of a SELECT DISTINCT... on every SELECT, and give the user no
> way to circumvent it?

Yes.

> Do we also have the behind-the-scenes constraint
> that every table must be unique across all columns, again without giving
> the user a way to circumvent?

Yes.

It's not relational otherwise.

But that doesn't mean we can't also have things like lists, which don't have these same restrictions.

Marshall Received on Sun Oct 10 2004 - 12:41:35 CDT