GATE CSE 2024 Session 2 Q20: Participation of weak and owner entity sets

In the context of owner and weak entity sets in the ER (Entity-Relationship) data model, which one of the following statements is TRUE?

Try it: multiple choice: exactly one correct option

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Answer: A (official GATE 2024 final answer key)

Concept used: A weak entity cannot exist without its owner, which it relies on for identification.

First step: Every weak entity must be related to some owner; an owner need not have any weak entities.

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Source: official GATE 2024 Session 2 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key