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(Alex Nuijten) Yesterday I attended John King (@royaltwit) session on Oracle 12c for developers. He gave an overview of all the goodies that are available to us as developers. The whole plugging and unplugging of database, though very cool and exiting, is most likely not very relevant to most developers.
When he discussed the possibility to have invisible columns in a table, it triggered the question: What happens when a NOT NULL column is made invisible?

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