Q.5 In SQL, foreign key constraints can only reference the primary key attributes of the referenced relation, or other attributes declared to be a super key using the unique constraint. As a result, total participation constraints on a many-to-many relationship (or on the "one" side of a one-to-many relationship) cannot be enforced on the relations created from the relationship, using primary key, foreign key and not null constraints on the relations. a. Explain the reason. b. Explain how
Q.5 In SQL, foreign key constraints can only reference the primary key attributes of the referenced relation, or other attributes declared to be a super key using the unique constraint. As a result, total participation constraints on a many-to-many relationship (or on the "one" side of a one-to-many relationship) cannot be enforced on the relations created from the relationship, using primary key, foreign key and not null constraints on the relations. a. Explain the reason. b. Explain how
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
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Q.5 In SQL, foreign key constraints can only reference the primary key attributes of the
referenced relation, or other attributes declared to be a super key using the unique constraint.
As a result, total participation constraints on a many-to-many relationship (or on the "one"
side of a one-to-many relationship) cannot be enforced on the relations created from the
relationship, using primary key, foreign key and not null constraints on the relations.
a. Explain the reason.
b. Explain how to enforce total participation constraints using complex check constraints or
assertions.
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