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Entity integrity requires that the primary key cannot be null. primary key cannot be unique. foreign key exists as a primary key in the related
Entity integrity requires that the
primary key cannot be null.
primary key cannot be unique.
foreign key exists as a primary key in the related table.
primary key exists as a foreign key in the related table.
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Relational Database Design A Practical Approach
Authors: Marilyn Campbell
1st Edition
1587193175, 978-1587193170
