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प्रश्न
State the following rules of DBMS.
Referential Integrity
थोडक्यात उत्तर
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उत्तर
- A referential integrity constraint is specified between two tables.
- In the Referential integrity constraints, if a foreign key in Table 1 refers to the Primary Key of Table 2, then every value of the Foreign Key in Table 1 must be null or be available in Table 2.
Example:
shaalaa.com
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