May 2024
Intermediate to advanced
325 pages
12h 2m
English
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
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Distributed Database Systems
key value must match a candidate key value of some tuples in another relation (may be the same
relation), or the foreign key value must be null. The relation that contains the foreign key is called
referencing relation, and the relation that contains the candidate key is called referenced relation.
Database modifi cations may violate the referential integrity constraint. The following anomalies
can occur in a relational database owing to referential integrity constraint:
Repetition anomaly – If a foreign key exists between two relations certain information
may be repeated unnecessarily. This is known as repetition ...
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