71
XQuery
•
Find books whose price is larger than average:
LET
$a
=
avg
(
document("bib.xml")
/
bib
/
book
/
price
)
FOR
$b
in
document("bib.xml")
/
bib
/
book
WHERE
$b
/
price
>
$a
RETURN
{
$b
}
Let’s try to write this in SQL…
