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whats is difference between key constraints and  entity integrity constraints?

i assume that entity integrity constraints is that in which primary key should not be null and unique but in key constraints pkis also there

is entity integrity onstraint  is the part of primary key constraints???????????????

1 Answer

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Key constraints are of many types from which entity integrety constraint is one which is associated with primary key value. Referential integrety constraint is another key constraint which deals with foreign key value.

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