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Describe domain constraints.
Domain constraints contain entity integrity and referential integrity. The domain is a set of values that might be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be null. Referential integrity states that every foreign key value must match a primary key value or be null.
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
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can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
what are the main characteristics of database
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