Consider the following UNIVERSITY DB, the given SQL query, and the provided canonical tree. Apply Transformation rules and heuristic algorithm to optimize the query. Student(sno,sname,address,phone) Professor(pno, ssn, pname, address, phone) Lecture(lno, pno, time, date) Attend(sno,lno) SELECT s.sname FROM student s, attend a, lecture l, professor p WHERE s.sno=a.sno AND a.lno=l.lno AND l.pno=p.pno and p.ssn=“100456”

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