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
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Question 3, continued.

  1.  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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