When he's not traipsing around Latin America, Tim Hall has had some really great 12c related posts on his blog recently.
He has created some articles on Implicit Statement Results and Extended Data Types with 12c, even if he wasn't excited about them at all!
Then he goes over Identity Columns and DEFAULT Values in his post here, and also has to update an old post on AutoNumber too.
Even more new features are covered in several articles on row limiting for Top-N queries and Multithreaded Model using THREADED_EXECUTION which also required him to re-write other articles as well. You really need to read some of the articles on this page about killing sessions/threads if you are going to 12c, as I've learned some new tricks for our environment and some are absolute killers (pun intended) for 12c!
Tim even helps us understand the WITH clause and how it has been enhanced with 12c, so if you are excited about that then finding out what the new tricks the DBFS is up to in 12c will probably knock your socks off!
Other than some good links to certification for 12c, this post outlines some "issues" he has found with the upcoming exams as well as a good general article about Oracle certification.
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