SELECT number, count(id) FROM tracking WHERE id IN (SELECT max(id) FROM tracking WHERE splitnr = 'a11' AND number >0 AND timestamp >= '2009-04-08 00:00:00' AND timestamp <= '2009-04-08 12:55:57' GROUP BY ident) GROUP BY number
SELECT number, count(id) FROM tracking WHERE id IN (SELECT max(id) FROM tracking WHERE splitnr
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How about this: