On Sep 5, 2012, at 3:03 PM, Richard Hipp <d...@sqlite.org> wrote:

>    SELECT id, a, b, ..., min(mtime)
>    FROM tab
>    GROUP BY id
>    ORDER BY min(mtime) DESC;

Perhaps something along these lines, i.e. a simple self-join:

select    foo.*
from      foo
join      (
            select    id,
                      min( mtime ) as mtime
            from      foo
  
            group by  id
          )
as        MinFoo
on        MinFoo.id = foo.id
and       MinFoo.mtime = foo.mtime

order by  foo.mtime desc


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