1. Consider the following SQL query:
SELECT P.Pname, E.Fname, E.Lname
FROM EMPLOYEE E, PROJECT P, WORK_ON W
WHERE W.Hours < 40 AND E.Ssn = W.Essn AND W.Pno = P.PnumberAND E.Sex = âFâ;
(a) Draw the query graph.
(b) Draw the initial query tree.
(c) Draw the optimized query tree using heuristicoptimization
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