Question
Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram?
Official answer and solution
- Official answer
- A
- From
- Official GATE 2020 answer key
Solution
Identify the standard ER diagram notation for weak entity sets and their identifying relationships.
In standard Entity-Relationship (ER) modeling:
- Strong entity set: Single rectangle.
- Weak entity set: Double (or bold) rectangle.
- Relationship set: Single diamond.
- Identifying relationship set (the supporting many-to-one relationship that connects a weak entity set to its owner/identifying entity set): Double (or bold) diamond.
- Multivalued attribute: Double oval.
- Key attribute: Single oval with underlined text.
Therefore, the supporting relationship is represented by diamonds with a double/bold border.
Final answer
A
The answer is the one in the official GATE answer key. The solution is this site's own explanation.
Source
- Paper
- GATE 2020 Computer Science and Information Technology (CS)
- Question
- 24 of 65, printed as CS Q.14
- Section
- Computer Science and Information Technology
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