SELECT arrdato.arrid, MAX(arrstart), COUNT(arrid) FROM arrdato WHERE
((arrdato.stedid=1 OR arrdato.arrangid=1) AND
arrdato.arrstart<'2009-01-22 14:00:21') GROUP BY arrdato.arrid ORDER
BY ~MAX(arrstart) LIMIT 10 OFFSET 0;
Result

[(3, u'2009-01-20 14:53:46', 1), (4, u'2009-01-14 16:56:11', 1), (5,
u'2009-01-11 16:58:00', 1), (12, u'2009-01-20 13:08:00', 1), (15,
u'2009-01-22 13:16:00', 1), (16, u'2009-01-20 13:34:00', 1), (1,
u'2008-12-31 15:08:41', 1)]

3       2009-01-20 14:53:46
4       2009-01-14 16:56:11
5       2009-01-11 16:58:00
12      2009-01-20 13:08:00
15      2009-01-22 13:16:00
16      2009-01-20 13:34:00
1       2008-12-31 15:08:41

I don't understand this result!? I first suspected that the wrong
order was caused by string values. But the "order by" should work even
for string-values.

Ascendig sort works fine:

SELECT arrdato.arrid, MAX(arrstart), COUNT(arrid) FROM arrdato WHERE
((arrdato.stedid=1 OR arrdato.arrangid=1) AND
arrdato.arrstart<'2009-01-22 14:11:21') GROUP BY arrdato.arrid ORDER
BY MAX(arrstart) LIMIT 10 OFFSET 0;
Result
[(1, u'2008-12-31 15:08:41', 1), (5, u'2009-01-11 16:58:00', 1), (4,
u'2009-01-14 16:56:11', 1), (12, u'2009-01-20 13:08:00', 1), (16,
u'2009-01-20 13:34:00', 1), (3, u'2009-01-20 14:53:46', 1), (15,
u'2009-01-22 13:16:00', 1)]
1       2008-12-31 15:08:41
5       2009-01-11 16:58:00
4       2009-01-14 16:56:11
12      2009-01-20 13:08:00
16      2009-01-20 13:34:00
3       2009-01-20 14:53:46
15      2009-01-22 13:16:00

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