Consider a relation involving suppliers, parts, and projects:Initial Table (SupplierPartsProjects)Supplier Part Project S1 P1 J1S1 P2 J1S1 P1 J2S2 P2 J2Assume the following constraints:i. Every part supplied for a project is supplied by all suppliers supplying any part for that project.ii. Every part supplied by a supplier is supplied by that supplier for all projects to which that supplier supplies any part.In the given example, what join dependencies exist on the table "SupplierPartsProjects"?{Supplier, Part} ⟶ SupplierPartsProjects{Supplier, Project} ⟶ SupplierPartsProjects{Part, Project} ⟶ SupplierPartsProjectsAll of the above
Question
Consider a relation involving suppliers, parts, and projects:Initial Table (SupplierPartsProjects)Supplier Part Project S1 P1 J1S1 P2 J1S1 P1 J2S2 P2 J2Assume the following constraints:i. Every part supplied for a project is supplied by all suppliers supplying any part for that project.ii. Every part supplied by a supplier is supplied by that supplier for all projects to which that supplier supplies any part.In the given example, what join dependencies exist on the table "SupplierPartsProjects"?{Supplier, Part} ⟶ SupplierPartsProjects{Supplier, Project} ⟶ SupplierPartsProjects{Part, Project} ⟶ SupplierPartsProjectsAll of the above
Solution
The join dependencies in the "SupplierPartsProjects" table are as follows:
- {Supplier, Part} ⟶ SupplierPartsProjects
- {Supplier, Project} ⟶ SupplierPartsProjects
- {Part, Project} ⟶ SupplierPartsProjects
These join dependencies exist because of the constraints mentioned. The first constraint implies that for a given part and project, all suppliers are involved. This leads to the join dependency {Supplier, Part} ⟶ SupplierPartsProjects.
The second constraint implies that for a given supplier and part, all projects are involved. This leads to the join dependency {Supplier, Project} ⟶ SupplierPartsProjects.
Finally, the combination of the two constraints implies that for a given part and project, all suppliers are involved, and for a given supplier and part, all projects are involved. This leads to the join dependency {Part, Project} ⟶ SupplierPartsProjects.
So, the answer is "All of the above".
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