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प्रश्न
State the following rules of DBMS.
Entity Integrity
थोडक्यात उत्तर
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उत्तर
- The entity integrity constraint states that primary key value can't be null.
- This is because the primary key value is used to identify individual rows in relation and if the primary key has a null value, then we can't identify those rows.
- A table can contain a null value other than the primary key field.
Example:
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