What is shown by this ERD?

Question

BlackTom AI · Accepted Answer

To understand what this ERD shows, we examine the possible relationships and the entities involved.
Option 1: Unary relationship between Supplier and Part. A unary relationship involves a single entity type participating in the relationship with itself. Since Supplier and Part are two distinct entity types, this cannot be a unary relationship. Therefore this option is incorrect.
Option 2: Binary relationship between Supplier and Project. A binary relationship connects exactly two entity types. If the diagram depicted only two entity types, Supplier and Project, in a direct relationship, this option could be plausible. However, the diagram in question does not show a direct relationship between Supplier and Project, so this option is not supported by the visual.
Option 3: Binary relationship between Project and Part. Similar to the previous option, a binary relationship would involve exactly two entities. The ERD provided does not show a direct Project–Part relationship, so this option is not consistent with the diagram.
Option 4: Ternary relationship between Supplier, Project and Part. A ternary relationship connects three entity types simultaneously. If the diagram represents a relationship that involves Supplier, Project, and Part together in a single relationship, this would be the correct description. The provided answer indicates that the diagram intends to illustrate such a three-way relationship, making this option consistent with the given key.
Option 5: All of the above. Since the diagram does not depict unary, nor direct binary relationships between the specified pairs, this composite option cannot be correct.
In summary, while the visual might appear to show a straightforward binary pairing, the supplied answer identifies a three-way (ternary) relationship among Supplier, Project, and Part as the accurate interpretation. The distinction hinges on recognizing whether all three entity types participate in a single relationship rather than in separate binary pairings, which would contradict the diagram’s structure.

What is shown by this ERD?

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