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May 13Where We're Going, We Don't Need Tables
by in Best of the Sidebar on 2013-06-06The Oracle database doesn’t allow you to execute a SELECT statement without a FROM clause. You can't, for example, do SELECT 2 + 2, you must do SELECT 2 + 2 FROM dual. “dual” is a fictional table which exists solely to allow these sorts of operations.
What it isn’t meant for is Aspirist’s sample, from the Sidebar.