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sql - How to select bottom most rows?

I can do SELECT TOP (200) ... but why not BOTTOM (200)?

Well not to get into philosophy what I mean is, how can I do the equivalent of TOP (200) but in reverse (from the bottom, like you'd expect BOTTOM to do...)?

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SELECT
    columns
FROM
(
     SELECT TOP 200
          columns
     FROM
          My_Table
     ORDER BY
          a_column DESC
) SQ
ORDER BY
     a_column ASC

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