While I might not go quite that far in many cases, I fully agree that 'table==object' is not abstraction. It's just convolution. In most database cases I've worked with, a single object might well have data in multiple tables. (With relations between each other.) Or an object could be made out of just part of a table. Thinking that an object is a table, and vice-versa, is just going to limit your idea of what can be done and what solutions are possible.
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