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Some database integrity constraints can be divided into 3 categories:

1) Domain Integrity

Null Constraint: Whether null value is allowed or not

Unique Constraint: Whether values should be unique or not.

2) Entity Integrity Vonstraint

Primary Key: This can be on a single field or multiple fields can be used to compose a primary key. This ensures that uniqueness of data and null is not allowed in field(s) marked as Primary key

3) Referential Integrity

The referential integrity constraint is specified between two tables and it is used to maintain the consistency among rows between the two tables and is defined using Foreign Key.

Hope this helps.

Regards,

Sanjay B.  

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