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Drop Table cannot be used to drop a table referenced by a _________ constraint.

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Drop Table cannot be used to drop a table referenced by a _________ constraint.

(a) Local Key

(b) Primary Key

(c) Composite Key

(d) Foreign Key

This question was addressed to me in class test.

This intriguing question originated from Constraints in section Database Systems Design and Implementation of Database Management

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Right choice is (d) Foreign Key

Explanation: Foreign key is used when primary key of one relation is used in another relation.

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