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The Long Version
I've used SQL Server and MySQL a fair deal and know standard ANSI SQL well enough. But now I work at a place that is all Oracle.
Googling terms like "switching to Oracle" has yield disappointing results.
The books I've seen, such as O'Reilly's Oracle SQL, want to teach me the entirety of SQL all over again. That'd be a lot of skimming to get to the relevant conundrums, like sequences and pseudo-columns.