Re: Extending my question. Was: The relational model and relationalalgebra - why did SQL become the industry standard?

From: Lauri Pietarinen <lauri.pietarinen_at_atbusiness.com>
Date: Sat, 15 Feb 2003 19:43:17 +0200
Message-ID: <3E4E7C35.9010800_at_atbusiness.com>

It might be interesting to note that Dataphor makes a clear distiction between relations and result sets that are returned to the user (or program etc...):

We would have the relational expression

emp OVER {salary} WHERE deptno = 1;

and then when it is returned we have

SELECT emp OVER {salary} WHERE deptno = 1 ORDER BY salary;

Quota queries look like this:

emp OVER {salary}

WHERE deptno = 1
RETURN 10 BY {salary desc}

so also making a distinction between ordering and quota queries.

regards,
Lauri Pietarinen Received on Sat Feb 15 2003 - 18:43:17 CET

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