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By default, which key creates Clustered index?

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By default, which key creates Clustered index?

(a) Foreign Key

(b) Unique Key

(c) Primary Key

(d) None of the Mentioned

I have been asked this question in an interview.

My question comes from Foreign, Candidate, Primary, Composite, Unique Keys topic in portion Planning Oracle Applications of Oracle

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Best answer
The correct answer is (c) Primary Key

Best explanation: Primary Key by default it adds a clustered index.

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