Relational Algebra and SQL Examples

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Presentation transcript:

Relational Algebra and SQL Examples Revised based on the notes from Dr. Shiyong Lu of Wayne State University Database Systems: An Application Oriented Approach, Edition 2 by Michael Kifer, Arthur Bernstein, Philip M. Lewis ISBN:0321268458 ISBN13:9780321268457 Release Date:March 2005

Relational Algebra and SQL Exercises Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) Please refer to the SQLite commands that create the test database.

Query 1 Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) Return those professors who have taught ‘CSCI203’ but never ‘CSCI240’.

Relational Algebra Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) ssn(crsname=‘CSCI203’(Taught)) -ssn(crsname=‘CSCI240’(Taught))

SQL Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) SELECT ssn From Taught Where crsname = ‘CSCI203’ EXCEPT Where crsname = ‘CSCI240’;

Query 2 Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) Return those professors who have taught both ‘CSCI203’ and ‘CSCI204’.

Relational Algebra Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) ssn(crsname=‘CSCI203’  crsname=‘CSCI204’ (Taught), wrong! ssn(crsname=‘CSCI203’(Taught))  ssn(crsname=‘CSCI204’(Taught)), correct!

SQL Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) SELECT T1.ssn From Taught T1, Taught T2 Where T1.crsname = ‘CSCI203’ AND T2.crsname=‘CSCI204’ AND T1.ssn=T2.ssn;

Query 3 Return those professors who have never taught ‘CSCI204’. Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) Return those professors who have never taught ‘CSCI204’.

Relational Algebra Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) ssn(crsname<>‘CSCI204’(Taught)), wrong answer! ssn(Professor) -ssn(crsname=‘CSCI204’(Taught)), correct answer!

SQL Solution Professor(ssn, profname, status) Course(crscode, crsname, credits) Taught(crsname, semester, ssn) SELECT ssn From Professor EXCEPT From Taught T Where T.crsname = ‘CSCI204’;