Create the list of all courses in which Joe Public received an A.
Using the document structure described in Exercise 15.23, formulate the following queries in XQuery:
{
LET $sset := doc("http://xyz.edu/student.xml")
//tuple[Name/@value="Joe Public"]
FOR $c IN doc("http://xyz.edu/course.xml")//tuple,
$s IN $sset
WHERE doc("http://xyz.edu/transcript.xml")
//tuple[StudId/@value=$s/Id/@value
and Grade/@value="A"]
RETURN $c
}
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