Re: What is a "data sublanguage"

From: Kira Yamato <>
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" <> 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.


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

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