Question
In the context of owner and weak entity sets in the ER (Entity-Relationship) data model, which one of the following statements is TRUE?
Official answer and solution
- Official answer
- A
- From
- Official GATE 2024 answer key
Solution
Use the existence dependency of a weak entity on its owner entity.
In the ER model, a weak entity cannot be uniquely identified by its own attributes alone and cannot exist without being associated with an owner (identifying) entity via the identifying relationship. Consequently, the weak entity set MUST have total participation in the identifying relationship (represented by a double line). By contrast, an owner entity need not own any weak entity, so the owner entity set may have partial participation.
Option (A)
The answer is the one in the official GATE answer key. The solution is this site's own explanation.
Source
- Paper
- GATE 2024 Computer Science and Information Technology - Set 2 (CS2)
- Question
- 20 of 65
- Section
- Computer Science and Information Technology
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