Qurey tree and heuristics rule for Query Optimization.

1-Draw the initial query tree, then show how the same query tree is improved by optimizing the inferential rules in another form

2-Draw the query graph

Please, I want the solution by drawing the tree, I don't want to solve it by writing

Q 4: SELECT Pnumber, Pname, COUNT (*) FROM PROJECT, WORKS_ON, EMPLOYEE WHERE Pnumber=Pno AND Ssn=Essn AND Dno=5 GROUP BY Pnumber, Pname