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-- @link: https://stackoverflow.com/questions/7745609/sql-select-only-rows-with-max-value-on-a-column?rq=1

-- Joining with simple group-identifier, max-value-in-group Sub-query
SELECT a.id, a.rev, a.contents
FROM YourTable a
INNER JOIN (
    SELECT id, MAX(rev) rev
    FROM YourTable
    GROUP BY id
) b ON a.id = b.id AND a.rev = b.rev


-- Left Joining with self, tweaking join conditions and filters
SELECT a.*
FROM YourTable a
LEFT OUTER JOIN YourTable b
    ON a.id = b.id AND a.rev < b.rev
WHERE b.id IS NULL;