Referential Integrity


Referential Integrity ensures that a value that appears in one relation for a given set of attributes also appears for a certain set of attributes in another relation.
If “CSE” is a branch name appearing in one of the tuples in the College relation (table), then there exists a tuple in the Department relation (table) for branch “CSE”.

Example in SQL:
create table customer
(customer-name           char(20),
customer-street            char(30),
customer-city  char(30),
primary key (customer-name))

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