Re: What is a "data sublanguage"

From: Kira Yamato <kirakun_at_earthlink.net>
Date: Tue, 18 Dec 2007 12:03:38 -0500
Message-ID: <2007121812033875249-kirakun_at_earthlinknet>


On 2007-12-18 11:19:57 -0500, "David Cressey" <cressey73_at_verizon.net> said:

> It's time for me to ask another dumb question.
>
> The term "data sublanguage" appears in Codd's 1970 paper. I kind of glossed
> over it when I first read it, figuring that my intuitive grasp was close
> enough. Now I'm wondering whether I really know what "data sublanguage"
> means, at all.
>
> What is a "data sublanguage"? What is the difference between a
> "sublanguage" and a "language"? Can a programming language embed a data
> sublanguage as a subset of the syntax and semantics of the programming
> language? Does the data sublanguage Codd was referring to span all the
> syntax and semantics of the relational data model?
>
> Did SQL take the place of the data sublanguage Codd was suggesting should be
> built? Have Date & Darwen or others created a relational data sublanguage?

Do you have Date's book An Introduction to Database Systems? It seems to have all the answers to all of your questions.

-- 

-kira
Received on Tue Dec 18 2007 - 18:03:38 CET

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