How many Integrity Rules are there and what are they

How many Integrity Rules are there and what are they
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1 Answer

Answer :

There are Three Integrity Rules. They are as follows ::
a) Entity Integrity Rule :: The Entity Integrity Rule enforces that the
Primary key cannot be Null
b) Foreign Key Integrity Rule :: The FKIR denotes that the relationship
between the foreign key and the primary key has to be enforced.When
there is data in Child Tables the Master tables cannot be deleted.
c) Business Integrity Rules :: The Third Intigrity rule is about the
complex business processes which cannot be implemented by the
above 2 rules.
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