At 18:09 22/12/2011, you wrote:
DELETE FROM t WHERE rowid != (SELECT t2.rowid FROM t t2 where t2.num = t.num ORDER BY t2.date LIMIT 1);
Are you sure that date will collate correctly, as entries appear to be in dd/mm/yyyy format?
Dates in non_ISO format are always a pain. IMHO if dates are to be stored in string format, then one should always store them in YYYY/MM/DD (with leading zeroes) then eventually display dates in whatever format suits users at the application level.
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