6.3. How does SQL allow implementation of the entity integrity and referential

integrity constraints described in Chapter 3? What about referential triggered

actions?

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I have this information can you verify?

Entity integrity and referential integrity constraints Entity integrity Referential integrity Entity integrity constraints:- In the entity integrity constraint, it states that no primary key value can be NULL because. Primary key value is used to identify the individual tuples in a relation. And having NULL values for the primary key implies that we can not identify some tuples. Referential integrity constraints It is specified between two relations and is used to maintain the consistency among tuples in the two relations and referential integrity constraints states that, a tuple in one relation that refers to another relation and must refer to an existing tuple in that relation. Referential triggered actions:- Schema Designer can specify an alternative action to taken when a referential integrity constraint is violated by attaching a referential triggered action clause to any foreign key constraint