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Referential integrity rule means that Foreign key can never be null Foreign key may or may not be null Primary key can never be null
Referential integrity rule means that Foreign key can never be null Foreign key may or may not be null Primary key can never be null A foreign key which identifies primary key of some table T must either be wholly null or match the value of the primary key of some row in T
Referential integrity rule means that
Foreign key can never be null
Foreign key may or may not be null
Primary key can never be null
A foreign key which identifies primary key of some table T must either be wholly
null or match the value of the primary key of some row in T
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Data Management Databases And Organizations
Authors: Richard T. Watson
6th Edition
1943153035, 978-1943153039
