Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram?
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Answer: A
In an Entity-Relationship (ER) diagram, the standard notations for representing various components are as follows:
- Weak Entity Set: Represented by a double rectangle (or rectangle with a double/bold border).
- Identifying Relationship: The supporting many-to-one relationship that connects a weak entity set to its identifying (strong) entity set is represented by a double diamond (or diamond with a double/bold border).
- Multivalued Attribute: Represented by a double oval.
- Key Attribute: Represented by an oval with an underlined name.
Since the question asks for the representation of the supporting many-one relationship of a weak entity set, it corresponds to the identifying relationship, which is represented by diamonds with a double/bold border.
Therefore, the correct option is A.
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