Question 3, continued. Suppose that we have 2 tables, A and B, specified by the following (partial) CREATE TABLE statements: CREATE TABLE A( a1 INTEGER, a2 INTEGER, PRIMARY KEY(a1)) CREATE TABLE B( a1 INTEGER, b1 INTEGER, b2 INTEGER, PRIMARY KEY(a1,b1), FOREIGN KEY(a1) REFERENCES A ON DELETE CASCADE) Suppose that A currently holds only a single record (a1=100, a2=200) and B holds only a single record (a1=100, b1=10, b2=20). Suppose that a user now enters the following: INSERT INTO B VALUES (111, 11, 22) Explain what would happen as a result. You must be specific and you must explain your answer. Suppose that a user now enters the following: DELETE FROM A WHERE a1=100 Explain what would happen as a result. You must be specific and you must explain your answer.
Question 3, continued. Suppose that we have 2 tables, A and B, specified by the following (partial) CREATE TABLE statements: CREATE TABLE A( a1 INTEGER, a2 INTEGER, PRIMARY KEY(a1)) CREATE TABLE B( a1 INTEGER, b1 INTEGER, b2 INTEGER, PRIMARY KEY(a1,b1), FOREIGN KEY(a1) REFERENCES A ON DELETE CASCADE) Suppose that A currently holds only a single record (a1=100, a2=200) and B holds only a single record (a1=100, b1=10, b2=20). Suppose that a user now enters the following: INSERT INTO B VALUES (111, 11, 22) Explain what would happen as a result. You must be specific and you must explain your answer. Suppose that a user now enters the following: DELETE FROM A WHERE a1=100 Explain what would happen as a result. You must be specific and you must explain your answer.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
Question 3, continued.
- Suppose that we have 2 tables, A and B, specified by the following (partial) CREATE TABLE statements:
CREATE TABLE A(
a1 INTEGER,
a2 INTEGER,
PRIMARY KEY(a1))
CREATE TABLE B(
a1 INTEGER,
b1 INTEGER,
b2 INTEGER,
PRIMARY KEY(a1,b1),
FOREIGN KEY(a1) REFERENCES A
ON DELETE CASCADE)
Suppose that A currently holds only a single record (a1=100, a2=200) and B holds only a single record (a1=100, b1=10, b2=20).
- Suppose that a user now enters the following:
INSERT
INTO B
VALUES (111, 11, 22)
Explain what would happen as a result. You must be specific and you must explain your answer.
- Suppose that a user now enters the following:
DELETE
FROM A
WHERE a1=100
Explain what would happen as a result. You must be specific and you must explain your answer.
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