The trigger below is defined on the relation T (C, D) with the primary key on the attr
The trigger below is defined on the relation T (C, D) with the primary key on the attr
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![The trigger below is defined on the relation T(C, D) with the primary key on the attribute C.
CREATE TRIGGER Secret
AFTER DELETE ON T
REFERENCING OLD ROW AS oldie
FOR EACH ROW
WHEN (oldie.C = ANY (SELECT D FROM T))
INSERT INTO T VALUES (oldie.C, oldie.D):
Which of the following best explains the conditions as enforced by this trigger?
a. Attribute D in T is a foreign key, referencing C.
b. Every key value also appears in a non-key column.
C. A key value that is present in a non-key column in another row cannot be removed.
d. Attribute D is unique.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5de9b1a7-ce04-43f5-87d9-4de3e25f8076%2F0bc3c4c2-5c1e-45c6-b17c-12a48485be10%2Fser5o8g_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The trigger below is defined on the relation T(C, D) with the primary key on the attribute C.
CREATE TRIGGER Secret
AFTER DELETE ON T
REFERENCING OLD ROW AS oldie
FOR EACH ROW
WHEN (oldie.C = ANY (SELECT D FROM T))
INSERT INTO T VALUES (oldie.C, oldie.D):
Which of the following best explains the conditions as enforced by this trigger?
a. Attribute D in T is a foreign key, referencing C.
b. Every key value also appears in a non-key column.
C. A key value that is present in a non-key column in another row cannot be removed.
d. Attribute D is unique.
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