Agregar base de datos existente y asignarla a SA (SQL Server)

CREATE DATABASE [BD_PRUEBA]
ON 
(
    FILENAME = '/var/opt/mssql/data/BD_PRUEBA.mdf'
),
(
    FILENAME = '/var/opt/mssql/data/BD_PRUEBA_log.ldf'
)
FOR ATTACH;
GO

USE [master];
GO

ALTER LOGIN [sa] ENABLE;
GO

ALTER AUTHORIZATION ON DATABASE::[BD_PRUEBA] TO [sa];
GO