Add the new login.
USE master
go
EXEC sp_addlogin 'NewMary'
go
--Change the user account to link with the 'NewMary' login.
USE pubs
go
EXEC sp_change_users_login 'Update_One', 'Mary', 'NewMary'
EXEC sp_change_users_login 'Update_One', 'ESPDAUser', 'ESPDAUser'
USE master
go
EXEC sp_addlogin 'NewMary'
go
--Change the user account to link with the 'NewMary' login.
USE pubs
go
EXEC sp_change_users_login 'Update_One', 'Mary', 'NewMary'
EXEC sp_change_users_login 'Update_One', 'ESPDAUser', 'ESPDAUser'