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)
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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffc42a076-5c06-46af-a63c-d94f125ca0b9%2F1dadf72a-8b39-4c7f-b372-19ec0300e6bc%2Fd06b1gj_processed.jpeg&w=3840&q=75)
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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