9. Ensuring Data Integrity : Integrities : Constraints Compared with Integrities : Differences in Null Handling Between Integrities and Constraints
 
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Differences in Null Handling Between Integrities and Constraints
Constraints and integrities handle nulls differently. Check constraints allow nulls by default, whereas integrities do not allow nulls by default. Instructions on how to allow nulls are described in Nulls and Integrities (see page Nulls and Integrities).