Solution that cannot be deleted by the original user when the SQL Server bak file is restored

You cannot create an identical user and mapping the user to the database, and you cannot delete the database user: DemoUser.
Please run the following script and then you can delete the user: DemoUser. Then create the user (DemoUser.) and mapping to the database.
Script:
Copy CodeThe code is as follows:
Go
ALTER AUTHORIZATION on role::[aspnet_membership_basicaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_membership_fullaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_membership_reportingaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_profile_basicaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_profile_fullaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_profile_reportingaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_roles_basicaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_roles_fullaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on role::[aspnet_roles_reportingaccess] to [dbo]
Go
Go
ALTER AUTHORIZATION on Schema::[db_owner] to [dbo]
Go
Go
ALTER AUTHORIZATION on Schema::[db_owner] to [db_owner]
Go