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

From: Mikito Harakiri <mikharakiri_at_ywho.com>
Date: Tue, 11 Mar 2003 14:27:46 -0800
Message-ID: <hvtba.14$pX3.84@news.oracle.com> 






"Jan Hidders" <jan.hidders_at_REMOVE.THIS.ua.ac.be> wrote in message
news:3e6e57e3.0_at_news.ruca.ua.ac.be...


 What I meant was:


>

> >>   SELECT f(x)

> >>   FROM


> >>     ( SELECT g(y)

> >>       FROM y IN Y ) AS x

>

> and

>

> >>   SELECT f(g(y))

> >>   FROM Y AS y




In set model



SELECT f(x) as Fx, y


FROM



  ( SELECT g(y) as x, y


    FROM Y)


reduces to



SELECT f(g(y)) as FGy, y


FROM Y

Received on Tue Mar 11 2003 - 16:27:46 CST












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