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If the rows in the table aren't in any order—and they
aren't, not in any relational database system—then how do you know
which one is the Nth one? You don't.
Therefore, pick any row of the table, and just pretend it's the Nth.
Of course, if you want to retrieve the Nth row based on the values
of some column, then that's a different question. It has an SQL
solution, too. But I'm not sure you have this situation.
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