You are migrating a database named Orders to a new server that runs Microsoft SQL Server 2012. You attempt to add a SQL login, [User1], to the database. However, you receive the following error…

You are migrating a database named Orders to a new server that runs Microsoft SQL Server 2012. You attempt to add a SQL login, [User1], to the database. However, you receive the following error message: "User already exists in current database." You need to configure the [User1] login to be able to access the Orders database and retain the original permissions. You need to achieve this goal by using the minimum required permissions. Which Transact-SQL statement should you use?