[xquery-talk] Incorrect Intersect and Except Output?

Wei, Alice J. ajwei at indiana.edu
Sat Mar 29 07:33:58 PST 2008

Hi, XQueriers:

  I think I am still having quite a bit of issues with this particular XPath expression.

  I have used the idea Jonathan Robie brought up last time by combining the expressions by calling the original variables

let $a := collection("xmldb:exist://db/cbm")//ad//address[contains(upper-case(.),$search)],
$c := collection("xmldb:exist://db/cbm")//ad//address[contains(upper-case(.),$search2)],

 if (($search ne "") and ($search4 eq "address") and ($search5 eq "address") and ($search2  ne "") and ($search7 eq "and") and ($search3 eq ""))
then  <div>{local:count-distinct-values($a intersect $c)}

I attempted to have this bring out only the items that contain the word $search and $search2 in the address tag, but it appears that it always brings one of the words back, and not just the result that contains both words. I tried switching the clause to $a except $c, but the result is always problematic.

I used what Jonathan showed me last time by writing this little snippet to try how intersect and except works:

let $a := <a><b>1</b><b>2</b><b>3</b></a>,
$b := <c><b>What</b><b>2</b><b>3</b><b>4</b></c>,
<foo>{$a except $b}</foo>



If I use $a intersect $b, it brings me an empty node <foo/>
Isn't intersect supposed to bring back what is contained in $b and $a?

As for except, since it supposed to bring only what is not co-shared between $a and $b, (according to the original concept in SQL), isn't it supposed to bring back


Am I missing something here?

Thanks for your help.

Alice Wei
MIS 2008
School of Library and Information Science
Indiana University Bloomington
ajwei at indiana.edu

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