HW1 - HW Assignment#01 Question 2.2 is hand-written...

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HW Assignment #01 Question 2.2 is hand-written. Question 3.12 1) CREATE TABLE Teaches ( ssn CHAR(11), cid INTEGER, sid INTEGER, PRIMARY KEY (ssn, cid, sid), FOREIGN KEY (ssn) REFERENCES Professor, FOREIGN KEY (cid) REFERENCES Course, FOREIGN KEY (sid) REFERENCES Semester ) CREATE TABLE Professor ( ssn INTEGER, PRIMARY KEY (ssn) ) CREATE TABLE Course ( cid INTEGER, PRIMARY KEY (cid) ) CREATE TABLE Semester ( sid INTEGER, PRIMARY KEY (sid) ) 2) CREATE TABLE Teaches ( ssn CHAR(11), cid INTEGER, semester INTEGER, PRIMARY KEY (ssn, cid), FOREIGN KEY (ssn) REFERENCES Professor, FOREIGN KEY (cid) REFERENCES Course ) CREATE TABLE Professor ( ssn INTEGER, PRIMARY KEY (ssn) ) CREATE TABLE Course ( cid INTEGER, PRIMARY KEY (cid) ) 3) We cannot specify a method for interpreting the participation constraint, because professor can teach more than one course, and that makes us unable to combine Professor and Course. Other than the participation constraint, the tables can be built as follows.
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  • Fall '08
  • Yang,J
  • Foreign key, primary key, REFERENCES Professor, CID INTEGER

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