Explain iDomain constraint iiSemantic integrity constraint Functional dependency constraint

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Explain i)Domain constraint ii)Semantic integrity constraint Functional dependency constraint

explain the terms


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Domain Constraint:

A domain is defined as the set of all unique values permitted for an attribute

Domain constraints allows us to test the values inserted into the database and to test the queries to make sure comparisons made are appropriate.

Examples: create domain wage numeric (5,2) constraint wage-value-test check (value >= 4.0)

Semantic Constraint:

Semantic integrity constraints describe properties of objects and relationships between data objects.

Functional Dependency Constraints:

Functional dependency is a relationship that exists when one attribute uniquely determines another attribute

A fuctional ependency is constraint between two sets of attributes in a relation from a database.


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