A weak entity that has a 1:1 identifying relationship with its owner,must have a partial key.

Question

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A weak entity in a 1:1 identifying relationship with its owner entity does not require a partial key because it is uniquely identified through its relationship with the owner entity. A partial key is needed in a situation where the weak entity is in a 1:N relationship with the owner entity to distinguish among multiple instances related to a single instance of the owner entity.

A Weak Entity That Has a 1:1 Identifying Relationship with Its