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SQL Server Error: The proposed new database owner is already a user or aliased in the database.

On a project I’m working on, I had to set the database owner. So I opened up SQL Server Management Studio, opened the Properties for the database and tried to set the owner. But it failed with the following error:

The proposed new database owner is already a user or aliased in the database.

It looks like you cannot set the owner of the database to a user that is already used for this database. To fix it, you first have to remove the user from the list of logins.

USE Northwind
GO
SP_DROPUSER 'myexistinguser'
GO
SP_CHANGEDBOWNER 'myexistinguser'
view raw changedbowner.sql hosted with ❤ by GitHub

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