sqlm0j0e (1/19/2016)

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This may sound weird but if you go through the SQL Server for the Oracle DBA class by Microsoft, you'll actually be able to learn quite a lot, including some foundational concepts (e.g. block vs page, user != user, etc...).

See https://mva.microsoft.com/en-us/training-courses/sql-server-2014-essentials-for-oracle-dbas-9062?l=VGDAvmR4_7004984382