Czy to zadziała dla Ciebie:
update duptest
set nonid = 'c'
WHERE ROWID IN (SELECT MIN (ROWID)
FROM duptest
GROUP BY id, nonid)
Czy to zadziała dla Ciebie:
update duptest
set nonid = 'c'
WHERE ROWID IN (SELECT MIN (ROWID)
FROM duptest
GROUP BY id, nonid)