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Asked: 2026-05-20T17:45:31+00:00

I have userid and role id fields in the table. In that table couple

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I have userid and role id fields in the table. In that table couple userid’s has two roles. But it shouldn’t.

example:

Userid(FK)    RoleID(FK)
1             1E36A840-2EBB-44EC-8861-0E3D262AC676
1             0B54F223-E0D4-4CFC-84C3-7C98C1BFC6DA
2             1E36A840-2EBB-44EC-8861-0E3D262AC676
3             0B54F223-E0D4-4CFC-84C3-7C98C1BFC6DA
4             1E36A840-2EBB-44EC-8861-0E3D262AC676
4             0B54F223-E0D4-4CFC-84C3-7C98C1BFC6DA

In this case I have to delete 1 and 4 where ‘1E36A840-2EBB-44EC-8861-0E3D262AC676’ which has ‘0B54F223-E0D4-4CFC-84C3-7C98C1BFC6DA’

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1 Answer

  1. Editorial Team

    You can prevent this from happening in the first place by putting a unique constraint on the Userid column. However, before doing this you will need to remove existing duplicates. Given the information we have so far (a Userid and a Roleid) there’s really no way to “correctly” do this. As @Joe Stefanelli mentioned in his comment, you’d need to decide which role is the “correct” one for each user. That sounds like a manual process. (Unless you know ahead of time that only the first one should be kept in each case, in which case @Thomas has a good answer.)

    Out of curiosity, is there a specific reason why a user can’t (or shouldn’t, in this case) have multiple roles? Usually that’s what roles are for, applying multiple permission sets, etc. to various users in a many-to-many fashion. Think of it in terms of object-oriented design. Roles are interfaces (types) and users are classes (implementations). By having multiple roles, each user can be polymorphic into multiple user types throughout the system.

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