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NIELIT Scientist B 2020 November: 43 / GATE Overflow for GATE CSE
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NIELIT Scientist B 2020 November: 43

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Partial Keys are a set of attributes with the help of which the tuples of the weak entities can be distinguished and identified.

Note – Weak entity always has total participation but Strong entity may not have total participation. The weak entity depends on the strong entity to ensure the existence of the weak entity.

So, the correct answer is $(C).$
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