Assume the table Students(studentID, firstName, lastName, unitID, WAM) where WAM stands for Weighted Average Mark. Assuming that some (but not all) entries under WAM are null entries, what will the following query do? SELECT unitID, AVG(WAM) FROM Students GROUP BY unitID HAVING AVG(WAM) >= ALL (SELECT AVG(WAM) FROM Students GROUP BY unitlD ); Select one: a. Will give an error message since there is no WHERE clauses in the outer query. Ob. Will display the unit(s) with the highest average WAM. Will give an error message since both the inner and the outer queries have the same GROUP BYclause d. Will give an error message since some rows of the Students table have null entries under WAM.
Assume the table Students(studentID, firstName, lastName, unitID, WAM) where WAM stands for Weighted Average Mark. Assuming that some (but not all) entries under WAM are null entries, what will the following query do? SELECT unitID, AVG(WAM) FROM Students GROUP BY unitID HAVING AVG(WAM) >= ALL (SELECT AVG(WAM) FROM Students GROUP BY unitlD ); Select one: a. Will give an error message since there is no WHERE clauses in the outer query. Ob. Will display the unit(s) with the highest average WAM. Will give an error message since both the inner and the outer queries have the same GROUP BYclause d. Will give an error message since some rows of the Students table have null entries under WAM.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Assume the table Students(studentID, firstName, lastName, unitID,
WAM) where WAM stands for Weighted Average Mark. Assuming that
some (but not all) entries under WAM are null entries, what will the
following query do?
SELECT unitID, AVG(WAM)
FROM Students
GROUP BY unitID
HAVING AVG(WAM) >= ALL
(SELECT AVG(WAM)
FROM Students
GROUP BY unitID
);
Select one:
а.
Will give an error message since there is no WHERE clauses in
the outer query.
O b. Will display the unit(s) with the highest average WAM.
C. Will give an error message since both the inner and the outer
queries have the same GROUP BYclause
d.
Will give an error message since some rows of
the Students table have null entries under WAM.
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