Consider the EMPLOYEE table's constraint EMPSUPERFK as specified in Figure 4.2 is changed to read as follows:
Question:
CONSTRAINT EMPSUPERFK
FOREIGN KEY (SUPERSSN) REFERNCES EMPLOYEE(SSN)
ON DELETE CASCADE ON UPDATE CASCADE,
Answer the following questions:
a. What happens when the following command is run on the database state shown in Figure 5.6? DELETE EMPLOYEE WHERE LNAME = 'Borg'
b. Is it better to CASCADE or SET NULL in case of EMPSUPERFK constraint ON DELETE?
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a The James E Borg entry is deleted from the table and each employee with ...View the full answer
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Related Book For 
Fundamentals of Database Systems
ISBN: 978-0136086208
6th edition
Authors: Ramez Elmasri, Shamkant Navathe
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