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Data Mgmt Lab_Part_8 - 22 Chapter 3 major INTEGER PRIMARY...

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22 Chapter 3 major INTEGER , PRIMARY KEY (grad ssn), FOREIGN KEY (major) REFERENCES Depts ) Note that the Major table is not necessary since each Graduate has only one major and so this can be an attribute in the Graduates table. 7. CREATE TABLE Advisor ( senior ssn CHAR(10) , grad ssn CHAR(10) , PRIMARY KEY (senior ssn, grad ssn), FOREIGN KEY (senior ssn) REFERENCES Graduates (grad ssn), FOREIGN KEY (grad ssn) REFERENCES Graduates ) 8. CREATE TABLE Manages ( pid INTEGER , prof ssn CHAR(10) , PRIMARY KEY (pid, prof ssn), FOREIGN KEY (prof ssn) REFERENCES Professors, FOREIGN KEY (pid) REFERENCES Projects ) 9. CREATE TABLE Work In ( pid INTEGER , prof ssn CHAR(10) , PRIMARY KEY (pid, prof ssn), FOREIGN KEY (prof ssn) REFERENCES Professors, FOREIGN KEY (pid) REFERENCES Projects ) Observe that we cannot enforce the participation constraint for Projects in the Work In table without check constraints or assertions in SQL. 10. CREATE TABLE Supervises ( prof ssn CHAR(10) , grad ssn CHAR(10) , pid INTEGER , PRIMARY KEY (prof ssn, grad ssn, pid), FOREIGN KEY (prof ssn) REFERENCES
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