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Asked: 2026-05-24T21:53:43+00:00

I’m new to Entity Framework and just experimenting… Consider 3 db tables where Person

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I’m new to Entity Framework and just experimenting…

Consider 3 db tables where Person is a base table. I want the Employe table to enherit from Person, storing employee specific info. It seems that EF requires that PersonId also be the PK of the Employee table, so I made EmployeeID a unique index.

Next I added a table, Application, which stores one record for every software application that the Employee supports, creating a foreign key from Application.EmployeeId to Employee.EmployeeId.

However, EF doesn’t seem to recognize relationships that involve unique indexes, but only Primary Keys.

What I can do is create a relationship from Application.PersonId to Person.PersonId, however, only Employees can be responsible for an Application, so it seems more natural to me to have Application as a “child” of the Employee table rather than the Person table.

Is this possible in EF?
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1 Answer

  1. Editorial Team

    You can build your relation between Employee (PersonId) and Application (EmployeeId). In such case the integrity should work as you expect because only PersonIds in Employee table will be only for existing employees. EF has currently no support for unique keys.

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