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Draw the initial query tree for this query, then show how the query tree is optimized (one rule at a time) and write the SQL query for the final optimized query tree.

Draw the initial query tree for this query, then show how the query tree is optimized (one rule at a time) and write the SQL query for the final optimized query tree.

Computer Networking: A Top-Down Approach (7th Edition)
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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Draw the initial query tree for this query, then show how the query tree is optimized (one rule at a time) and write the SQL query for the final optimized query tree.
For each of the following queries: a- Draw the query graph. b- Draw the query tree corresponding to the relational algebra expression. c- Draw the initial query tree, then show how the same query tree is optimized by heuristic rules optimization in another figure. Q1: Q2: Q 3: Q 4: SELECT Fname, Lname, Address FROM WHERE SELECT FROM WHERE SELECT FROM WHERE EMPLOYEE, DEPARTMENT Dname='Research' AND Dnumber=Dno; E.Fname, E.Lname, S.Fname, S.Lname EMPLOYEE AS E, EMPLOYEE AS S E.Super_ssn=S.Ssn; E.Fname, E.LName, E.Address EMPLOYEE E, DEPARTMENT D D.DName='Research' AND D.Dnumber=E.Dno; SELECT FROM WHERE GROUP BY Pnumber, Pname; Pnumber, Pname, COUNT(*) PROJECT, WORKS ON, EMPLOYEE Pnumber Pno AND Ssn-Essn AND Dno=5
Transcribed Image Text:For each of the following queries: a- Draw the query graph. b- Draw the query tree corresponding to the relational algebra expression. c- Draw the initial query tree, then show how the same query tree is optimized by heuristic rules optimization in another figure. Q1: Q2: Q 3: Q 4: SELECT Fname, Lname, Address FROM WHERE SELECT FROM WHERE SELECT FROM WHERE EMPLOYEE, DEPARTMENT Dname='Research' AND Dnumber=Dno; E.Fname, E.Lname, S.Fname, S.Lname EMPLOYEE AS E, EMPLOYEE AS S E.Super_ssn=S.Ssn; E.Fname, E.LName, E.Address EMPLOYEE E, DEPARTMENT D D.DName='Research' AND D.Dnumber=E.Dno; SELECT FROM WHERE GROUP BY Pnumber, Pname; Pnumber, Pname, COUNT(*) PROJECT, WORKS ON, EMPLOYEE Pnumber Pno AND Ssn-Essn AND Dno=5
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