SQL Server 2008 for the Oracle DBA – Free online training
This free 15 module, level 300 course provides students with the knowledge and skills to capitalize on their skills and experience as an Oracle DBA to manage a Microsoft SQL Server 2008 system. This workshop provides a quick start for the Oracle DBA to map, compare, and contrast the realm of Oracle database management to SQL Server database management.
You can view the series from here: https://technet.microsoft.com/en-us/sqlserver/dd548020.aspx