66
XQuery
Same as before, but eliminate duplicates:
FOR $x
IN bib/book[title/text()
= “Database Theory”]/author
$y IN distinct(bib/book[author/text() = $x/text()]/title)
$y IN distinct(bib/book[author/text() = $x/text()]/title)
RETURN
<answer> { $y/text() } </answer>
Result:
<answer>
abc </ answer >
< answer >
def </ answer >
< answer >
ghi </ answer >
distinct = a
function
that eliminates duplicates
that eliminates duplicates