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GATE | GATE IT 2006 | Question 62
Consider the following XML DTD describing course information in a university:
XML
What is returned by the following XQuery?
let $as := / /@Score
for $c in /Univ/Course[Eval]
let $cs := $c/Eval?@Score
where min($cs) > avg($as)
return $c
<!ELEMENT Univ (Course+, Prof+)>
<!ELEMENT Course (Title, Eval*)>
<!ATTLIST Course Number ID #REQUIRED Instructor IDREF #IMPLIED>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Eval (#PCDATA)>
<!ATTLIST Eval Score CDATA #REQUIRED>
<!ELEMENT Prof EMPTY>
<!ATTLIST Prof Name ID #REQUIRED Teaches IDREF #IMPLIED>
for $c in /Univ/Course[Eval]
let $cs := $c/Eval?@Score
where min($cs) > avg($as)
return $c
(A)
The professor with the lowest course evaluation
(B)
Professors who have all their course evaluations above the university average
(C)
The course with the lowest evaluation
(D)
Courses with all evaluations above the university average
Answer
Please comment below if you find anything wrong in the above post
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