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E-R model uses this symbol to represent weak entity set ?

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E-R model uses this symbol to represent weak entity set ?

(a) Dotted rectangle

(b) Diamond

(c) Doubly outlined rectangle

(d) None of the Mentioned

The question was posed to me in examination.

My question is from Attribute, Tuple and Entity in division Planning Oracle Applications of Oracle

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Best answer
The correct option is (c) Doubly outlined rectangle

Explanation: A weak entity set is indicated by a doubly-outlined box.

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