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Editorial Team
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Asked: 2026-05-22T21:58:59+00:00

I have a user table with userid (pk), password, usertype . I have another

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I have a user table with userid (pk), password, usertype.

I have another table student with stdid (pk), stdname, stdaddress.

I have a third table faculty with facid (pk), facname, facaddress.

What I want to do is populate the user table with the pk from either student table or faculty table.

How do I implement this in SQL Server 2005.

Can someone help me?

Edited Below

In my database, the student and faculty table are already implemented as part of another module. I need to implement the authentication part over LAN to be able to be accessed from anywhere, so I can not restructure that part. So I am using the user table with userid (username) and password in that table.

The userid is either stdid or facid and also the pk of the user table.

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1 Answer

  1. Editorial Team

    What you have is a bad design. You do not want to use one or the other other PK as the PK in a table. This cannot every work. What happens when you try to insert student 10 (who is Joe Jones) but faculty 10 (Mary Smith) is already in the table. Well, the insert would fail becuse of the unique requirement of a PK.

    If all studetns and faculty are always users, then userID is the PK and FacultyId and StudentID are the FKs to that table not the reverse.

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