Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe

Exercise 6

Exercise 3.11
Suppose that each of the following Update operations is applied directly to
the database state shown in Figure 3.6.
Discuss all integrity constraints violated by each operation, if any, and the different ways of enforcing these constraints.
a. Insert <'Robert', 'F', 'Scott', '943775543', '1972-06-21', '2365 Newcastle Rd,
Bellaire, TX', M, 58000, '888665555', 1> into EMPLOYEE.
b. Insert <'ProductA', 4, 'Bellaire', 2> into PROJECT.
c. Insert <'Production', 4, '943775543', '2007-10-01'> into DEPARTMENT.
d. Insert <'677678989', NULL, '40.0'> into WORKS_ON.
e. Insert <'453453453', 'John', 'M', '1990-12-12', 'spouse'> into DEPENDENT.
f. Delete the WORKS_ON tuples with Essn = '333445555'.
g. Delete the EMPLOYEE tuple with Ssn = '987654321'.
h. Delete the PROJECT tuple with Pname = 'ProductX'.
i. Modify the Mgr_ssn and Mgr_start_date of the DEPARTMENT tuple with
Dnumber = 5 to '123456789' and '2007-10-01', respectively.
j. Modify the Super_ssn attribute of the EMPLOYEE tuple with Ssn =
'999887777' to '943775543'.
k. Modify the Hours attribute of the WORKS_ON tuple with Essn =
'999887777' and Pno = 10 to '5.0'.
-Specify the updates of Exercise 3.11 using the SQL update commands.