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RE: Grouping-by appropriate values from external docu

Subject: RE: Grouping-by appropriate values from external document.
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Fri, 21 Oct 2005 15:06:57 +0100
sql culture
> It actually makes it hard to give general advice: On the 
> whole I assume
> (when writing answers, if not in my own code) that there is no
> optimisation going on.

Yes, that's reasonable advice.

To be honest, the main reason for this optimization was for XQuery, where
(a) there isn't an equivalent to xsl:key, and (b) there is a strong user
expectation based on years of SQL culture that the first optimization every
processor will attempt is a join optimization. But it's a nice bonus that it
works with XSLT too, except for those who earn a living by tuning other
people's code...

Michael Kay

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