[xquery-talk] where clause
G. Ken Holman
gkholman at CraneSoftwrights.com
Wed Mar 27 05:18:41 PST 2013
At 2013-03-27 08:31 -0400, Michael Sokolov wrote:
>I'm trying to come up with examples in which "where" clauses cannot
>be rewritten as XPath predicates. So far, the ones I have all
>involve an "at" counter. Are there others?
I can see no difference off hand when creating 1-tuples, as a 1-tuple
is essentially just a sequence.
However, when creating n-tuples (either with the "at" keyword as you
say or with other bound variables in your expression), the where
clause acts on the tuple, not just on a set of values. Here is a
3-tuple expression example:
for $a in expr1, $b in expr2, $c in expr3
where $a=$b+$c
return $a
I hope this is helpful.
. . . . . . . . Ken
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